diff --git a/sc2/src/sc2code/oscill.c b/sc2/src/sc2code/oscill.c
index fddc758c6..f7aaecd18 100644
--- a/sc2/src/sc2code/oscill.c
+++ b/sc2/src/sc2code/oscill.c
@@ -55,6 +55,7 @@ UninitOscilloscope (void)
 		TFB_DrawImage_Delete (scope_surf);
 		scope_surf = NULL;
 	}
+	scope_init = 0;
 }
 
 // draws the oscilloscope