diff --git a/libc/include/string.h b/libc/include/string.h
index 16fc4b6..7611b80 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -98,7 +98,7 @@
 
 char* strerror(int);
 char* strerror_l(int, locale_t) __INTRODUCED_IN(23);
-#if defined(__USE_GNU)
+#if defined(__USE_GNU) && __ANDROID_API__ >= 23
 char* strerror_r(int, char*, size_t) __RENAME(__gnu_strerror_r) __INTRODUCED_IN(23);
 #else /* POSIX */
 int strerror_r(int, char*, size_t);