diff --git a/lib/diagnostics.C b/lib/diagnostics.C
index c2bce7e241..086819b439 100644
--- a/lib/diagnostics.C
+++ b/lib/diagnostics.C
@@ -57,7 +57,7 @@
 #define MAX_STDOUT_FILE_SIZE        2048*1024
 
 
-#ifdef _WIN32
+#if defined(_WIN32) && defined(_MSC_VER)
 
 static _CrtMemState start_snapshot; 
 static _CrtMemState finish_snapshot;