diff --git a/sc2/src/libs/uio/debug.h b/sc2/src/libs/uio/debug.h
index 2d3a4de46..03999a30f 100644
--- a/sc2/src/libs/uio/debug.h
+++ b/sc2/src/libs/uio/debug.h
@@ -19,7 +19,7 @@
  */
 
 #ifndef _DEBUG_H
-#define DEBUG_H
+#define _DEBUG_H
 
 void uio_debugInteractive(FILE *in, FILE *out, FILE *err);