diff --git a/include/libssh/threads.h b/include/libssh/threads.h
index e8ccf7be..522f91d5 100644
--- a/include/libssh/threads.h
+++ b/include/libssh/threads.h
@@ -29,7 +29,7 @@
 #include <pthread.h>
 #define SSH_MUTEX pthread_mutex_t
 
-#if defined _GNU_SOURCE
+#if defined(PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP)
 #define SSH_MUTEX_STATIC_INIT PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
 #else
 #define SSH_MUTEX_STATIC_INIT PTHREAD_MUTEX_INITIALIZER