diff --git a/libc/bionic/ndk_cruft.cpp b/libc/bionic/ndk_cruft.cpp
index ed60ea4..cb9c9c9 100644
--- a/libc/bionic/ndk_cruft.cpp
+++ b/libc/bionic/ndk_cruft.cpp
@@ -32,6 +32,7 @@
 #include <ctype.h>
 #include <inttypes.h>
 #include <pthread.h>
+#include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ -226,4 +227,15 @@
   return wcsstr(haystack, needle);
 }
 
+// This was removed from POSIX 2008.
+extern "C" sighandler_t bsd_signal(int signum, sighandler_t handler) {
+  return signal(signum, handler);
+}
+
+// sysv_signal() was never in POSIX.
+extern sighandler_t _signal(int signum, sighandler_t handler, int flags);
+extern "C" sighandler_t sysv_signal(int signum, sighandler_t handler) {
+  return _signal(signum, handler, SA_RESETHAND);
+}
+
 #endif
diff --git a/libc/bionic/signal.cpp b/libc/bionic/signal.cpp
index 48b2e72..66d75bd 100644
--- a/libc/bionic/signal.cpp
+++ b/libc/bionic/signal.cpp
@@ -28,7 +28,12 @@
 
 #include <signal.h>
 
-static sighandler_t _signal(int signum, sighandler_t handler, int flags) {
+#ifdef __LP64__
+static
+#else
+__LIBC_HIDDEN__
+#endif
+sighandler_t _signal(int signum, sighandler_t handler, int flags) {
   struct sigaction sa;
   sigemptyset(&sa.sa_mask);
   sa.sa_handler = handler;
@@ -41,14 +46,6 @@
   return (sighandler_t) sa.sa_handler;
 }
 
-sighandler_t bsd_signal(int signum, sighandler_t handler) {
-  return _signal(signum, handler, SA_RESTART);
-}
-
-sighandler_t sysv_signal(int signum, sighandler_t handler) {
-  return _signal(signum, handler, SA_RESETHAND);
-}
-
 sighandler_t signal(int signum, sighandler_t handler) {
-  return bsd_signal(signum, handler);
+  return _signal(signum, handler, SA_RESTART);
 }
diff --git a/libc/include/signal.h b/libc/include/signal.h
index 45c1cda..0063b24 100644
--- a/libc/include/signal.h
+++ b/libc/include/signal.h
@@ -102,8 +102,6 @@
 extern int sigaction(int, const struct sigaction*, struct sigaction*);
 
 extern sighandler_t signal(int, sighandler_t);
-extern sighandler_t bsd_signal(int, sighandler_t);
-extern sighandler_t sysv_signal(int, sighandler_t);
 
 extern int siginterrupt(int, int);