diff --git a/libc/upstream-netbsd/android/include/netbsd-compat.h b/libc/upstream-netbsd/android/include/netbsd-compat.h
index 0212d1664..8d1c46b22 100644
--- a/libc/upstream-netbsd/android/include/netbsd-compat.h
+++ b/libc/upstream-netbsd/android/include/netbsd-compat.h
@@ -32,6 +32,6 @@
 #define __unlockenv() 0
 
 #include <stddef.h>
-int reallocarr(void*, size_t, size_t);
+__LIBC_HIDDEN__ int reallocarr(void*, size_t, size_t);
 
 #endif