diff --git a/src/OSSupport/Errors.cpp b/src/OSSupport/Errors.cpp
index 7fcd3168f..ce2e2acb0 100644
--- a/src/OSSupport/Errors.cpp
+++ b/src/OSSupport/Errors.cpp
@@ -22,7 +22,7 @@ AString GetOSErrorString( int a_ErrNo)
 	
 	// According to http://linux.die.net/man/3/strerror_r there are two versions of strerror_r():
 	
-	#if !defined(__APPLE__) && defined( _GNU_SOURCE) && !defined(ANDROID_NDK)  // GNU version of strerror_r()
+	#if defined(__GLIBC__) && defined( _GNU_SOURCE) && !defined(ANDROID_NDK)  // GNU version of strerror_r()
 	
 	char * res = strerror_r( errno, buffer, ARRAYCOUNT(buffer));
 	if (res != nullptr)