diff --git a/libc/bionic/stubs.cpp b/libc/bionic/stubs.cpp
index 2c2b74b..41ecd09 100644
--- a/libc/bionic/stubs.cpp
+++ b/libc/bionic/stubs.cpp
@@ -89,9 +89,11 @@
   // Copy the strings.
   snprintf(buf, byte_count, "%s%c%s%c%s", src->pw_name, 0, src->pw_dir, 0, src->pw_shell);
 
-  // pw_passwd is non-POSIX and unused (always NULL) in bionic.
-  // pw_gecos is non-POSIX and missing in bionic.
+  // pw_passwd and pw_gecos are non-POSIX and unused (always NULL) in bionic.
   dst->pw_passwd = NULL;
+#ifdef __LP64__
+  dst->pw_gecos = NULL;
+#endif
 
   // Copy the integral fields.
   dst->pw_gid = src->pw_gid;
diff --git a/libc/include/pwd.h b/libc/include/pwd.h
index 6f3fad5..6d483c0 100644
--- a/libc/include/pwd.h
+++ b/libc/include/pwd.h
@@ -100,12 +100,15 @@
 
 struct passwd
 {
-    char* pw_name;
-    char* pw_passwd;
-    uid_t pw_uid;
-    gid_t pw_gid;
-    char* pw_dir;
-    char* pw_shell;
+  char* pw_name;
+  char* pw_passwd;
+  uid_t pw_uid;
+  gid_t pw_gid;
+#ifdef __LP64__
+  char* pw_gecos;
+#endif
+  char* pw_dir;
+  char* pw_shell;
 };
 
 __BEGIN_DECLS
diff --git a/tests/stubs_test.cpp b/tests/stubs_test.cpp
index 7d70aa6..9b0c231 100644
--- a/tests/stubs_test.cpp
+++ b/tests/stubs_test.cpp
@@ -41,6 +41,10 @@
   EXPECT_STREQ(username, pwd->pw_name);
   EXPECT_EQ(uid, pwd->pw_uid);
   EXPECT_EQ(uid, pwd->pw_gid);
+  ASSERT_EQ(NULL, pwd->pw_passwd);
+#ifdef __LP64__
+  ASSERT_EQ(NULL, pwd->pw_gecos);
+#endif
 
   if (uid_type == TYPE_SYSTEM) {
     EXPECT_STREQ("/", pwd->pw_dir);