diff --git a/libc/include/sys/cdefs_elf.h b/libc/include/sys/cdefs_elf.h
index 6bb0a5720..a40a867b8 100644
--- a/libc/include/sys/cdefs_elf.h
+++ b/libc/include/sys/cdefs_elf.h
@@ -34,10 +34,6 @@
     __asm__(".global " #alias "\n" \
             #alias " = " #sym);
 
-#define __weak_alias(alias,sym) \
-    __asm__(".weak " #alias "\n" \
-            #alias " = " #sym);
-
 /* We use __warnattr instead of __warn_references.
  * TODO: remove this and put an empty definition in one of the upstream-* compatibility headers.
  */
diff --git a/libc/upstream-netbsd/android/include/namespace.h b/libc/upstream-netbsd/android/include/namespace.h
index 5df543cfc..630ea9b06 100644
--- a/libc/upstream-netbsd/android/include/namespace.h
+++ b/libc/upstream-netbsd/android/include/namespace.h
@@ -17,11 +17,6 @@
 #ifndef _BIONIC_NETBSD_NAMESPACE_H_included
 #define _BIONIC_NETBSD_NAMESPACE_H_included
 
-// NetBSD uses __weak_alias on a lot of functions. We don't want that.
-#if defined(__weak_alias)
-#undef __weak_alias
-#endif
-
 __LIBC_HIDDEN__ int __res_enable_mt(void);
 __LIBC_HIDDEN__ int __res_disable_mt(void);
 
diff --git a/libc/upstream-openbsd/android/include/openbsd-compat.h b/libc/upstream-openbsd/android/include/openbsd-compat.h
index b9768e185..630094d99 100644
--- a/libc/upstream-openbsd/android/include/openbsd-compat.h
+++ b/libc/upstream-openbsd/android/include/openbsd-compat.h
@@ -32,6 +32,9 @@
 #define _warn warn
 #define _warnx warnx
 
+/* Ignore all __weak_alias in OpenBSD. */
+#define __weak_alias(alias,sym)
+
 /* OpenBSD's <ctype.h> uses these names, which conflicted with stlport.
  * Additionally, we changed the numeric/digit type from N to D for libcxx.
  */