diff --git a/src/cmdlib.h b/src/cmdlib.h
index 05e515374..b035842cd 100644
--- a/src/cmdlib.h
+++ b/src/cmdlib.h
@@ -16,7 +16,7 @@
 #include <stdarg.h>
 
 // the dec offsetof macro doesnt work very well...
-#define myoffsetof(type,identifier) ((size_t)&((type *)1)->identifier - 1)
+#define myoffsetof(type,identifier) ((size_t)&((type *)alignof(type))->identifier - alignof(type))
 
 int		Q_filelength (FILE *f);
 bool FileExists (const char *filename);