diff --git a/crypto/o_str.c b/crypto/o_str.c
index 9ad7a89dcadfe73f39e999790b166e5fd474118c..1eee816152e1c411ec309a2b5a2bf3f34ac33d2f 100755
--- a/crypto/o_str.c
+++ b/crypto/o_str.c
@@ -222,7 +222,7 @@ int openssl_strerror_r(int errnum, char *buf, size_t buflen)
 {
 #if defined(_MSC_VER) && _MSC_VER>=1400
     return !strerror_s(buf, buflen, errnum);
-#elif defined(_GNU_SOURCE)
+#elif defined(_GNU_SOURCE) && !defined(__MUSL__)
     char *err;
 
     /*