diff --git a/Contrib/Math/Source/plugin.c b/Contrib/Math/Source/plugin.c
index 9a5998e9..859a00ab 100644
--- a/Contrib/Math/Source/plugin.c
+++ b/Contrib/Math/Source/plugin.c
@@ -1,5 +1,4 @@
 #include <windows.h>
-#include <crtdbg.h>
 #include "MyMath.h"
 #include "Math.h"
 
@@ -9,6 +8,8 @@ char *g_variables;
 
 #ifdef _DEBUG_LEAKS
 
+#include <crtdbg.h>
+
 int blocksnum = 0;
 HGLOBAL blocks[100000];