diff --git a/source/system/dbg.cpp b/source/system/dbg.cpp
index 2b0778bb7..30633f63c 100644
--- a/source/system/dbg.cpp
+++ b/source/system/dbg.cpp
@@ -259,6 +259,7 @@ void DoAssert( const char * Txt, const char * file, const int line )
 	FontBank	F;
 	char		Text[2048];
 
+	ClearScreenImage();
 
 	sprintf( Text, "%s\nLine %d in %s", Txt, line, file );