diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index c453850..23fc944 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -454,7 +454,6 @@
 
 __BEGIN_DECLS
 
-#if !defined(__clang__)
 __BIONIC_FORTIFY_INLINE
 __printflike(3, 0)
 int vsnprintf(char *dest, size_t size, const char *format, __va_list ap)
@@ -468,7 +467,6 @@
 {
     return __builtin___vsprintf_chk(dest, 0, __bos(dest), format, ap);
 }
-#endif /* !defined(__clang__) */
 
 #if defined(__clang__)
 #define snprintf(dest, size, ...) __builtin___snprintf_chk(dest, size, 0, __bos(dest), __VA_ARGS__)
diff --git a/tests/fortify1_test.cpp b/tests/fortify1_test.cpp
index afc9b11..d4e9dd5 100644
--- a/tests/fortify1_test.cpp
+++ b/tests/fortify1_test.cpp
@@ -19,6 +19,7 @@
 
 #include <gtest/gtest.h>
 #include <string.h>
+#include <stdarg.h>
 
 #if __BIONIC__
 // We have to say "DeathTest" here so gtest knows to run this test (which exits)
@@ -106,6 +107,49 @@
   ASSERT_EXIT(sprintf(buf, "aaaaa"), testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(buf, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify1_DeathTest, vsprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify1_DeathTest, vsprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(buf, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify1_DeathTest, vsnprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify1_DeathTest, vsnprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 TEST(Fortify1_DeathTest, strncat_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
diff --git a/tests/fortify1_test_clang.cpp b/tests/fortify1_test_clang.cpp
index 9f5b8b5..8759c41 100644
--- a/tests/fortify1_test_clang.cpp
+++ b/tests/fortify1_test_clang.cpp
@@ -19,6 +19,7 @@
 
 #include <gtest/gtest.h>
 #include <string.h>
+#include <stdarg.h>
 
 #if __BIONIC__
 // We have to say "DeathTest" here so gtest knows to run this test (which exits)
@@ -106,6 +107,49 @@
   ASSERT_EXIT(sprintf(buf, "aaaaa"), testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(buf, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify1_Clang_DeathTest, vsprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify1_Clang_DeathTest, vsprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(buf, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify1_Clang_DeathTest, vsnprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify1_Clang_DeathTest, vsnprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 TEST(Fortify1_Clang_DeathTest, strncat_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
diff --git a/tests/fortify2_test.cpp b/tests/fortify2_test.cpp
index 9a13612..1fa34ca 100644
--- a/tests/fortify2_test.cpp
+++ b/tests/fortify2_test.cpp
@@ -19,6 +19,7 @@
 
 #include <gtest/gtest.h>
 #include <string.h>
+#include <stdarg.h>
 
 struct foo {
   char empty[0];
@@ -53,6 +54,49 @@
               testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper2(const char *fmt, ...) {
+  foo myfoo;
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(myfoo.a, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_DeathTest, vsprintf_fortified2) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper2("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_DeathTest, vsprintf2_fortified2) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper2("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper2(const char *fmt, ...) {
+  foo myfoo;
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(myfoo.a, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_DeathTest, vsnprintf_fortified2) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper2("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_DeathTest, vsnprintf2_fortified2) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper2("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 #if __BIONIC__
 // zero sized target with "\0" source (should fail)
 TEST(Fortify2_DeathTest, strcpy_fortified2) {
@@ -250,6 +294,49 @@
   ASSERT_EXIT(sprintf(buf, "aaaaa"), testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(buf, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_DeathTest, vsprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_DeathTest, vsprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(buf, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_DeathTest, vsnprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_DeathTest, vsnprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 TEST(Fortify2_DeathTest, strncat_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];
diff --git a/tests/fortify2_test_clang.cpp b/tests/fortify2_test_clang.cpp
index 7183bc0..83f57e8 100644
--- a/tests/fortify2_test_clang.cpp
+++ b/tests/fortify2_test_clang.cpp
@@ -19,6 +19,7 @@
 
 #include <gtest/gtest.h>
 #include <string.h>
+#include <stdarg.h>
 
 struct foo {
   char empty[0];
@@ -123,6 +124,49 @@
   ASSERT_EXIT(sprintf(buf, "aaaaa"), testing::KilledBySignal(SIGABRT), "");
 }
 
+static int vsprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+
+  va_start(va, fmt);
+  result = vsprintf(buf, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_Clang_DeathTest, vsprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_Clang_DeathTest, vsprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+static int vsnprintf_helper(const char *fmt, ...) {
+  char buf[10];
+  va_list va;
+  int result;
+  size_t size = atoi("11");
+
+  va_start(va, fmt);
+  result = vsnprintf(buf, size, fmt, va); // should crash here
+  va_end(va);
+  return result;
+}
+
+TEST(Fortify2_Clang_DeathTest, vsnprintf_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("%s", "0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
+TEST(Fortify2_Clang_DeathTest, vsnprintf2_fortified) {
+  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
+  ASSERT_EXIT(vsnprintf_helper("0123456789"), testing::KilledBySignal(SIGABRT), "");
+}
+
 TEST(Fortify2_Clang_DeathTest, strncat_fortified) {
   ::testing::FLAGS_gtest_death_test_style = "threadsafe";
   char buf[10];