diff --git a/code/renderergl2/tr_model.c b/code/renderergl2/tr_model.c
index f2f55425..b385dee6 100644
--- a/code/renderergl2/tr_model.c
+++ b/code/renderergl2/tr_model.c
@@ -1132,6 +1132,7 @@ static qboolean R_LoadMDR( model_t *mod, void *buffer, int filesize, const char
 ** RE_BeginRegistration
 */
 void RE_BeginRegistration( glconfig_t *glconfigOut ) {
+	int	i;
 
 	R_Init();
 
@@ -1140,7 +1141,10 @@ void RE_BeginRegistration( glconfig_t *glconfigOut ) {
 	R_IssuePendingRenderCommands();
 
 	tr.visIndex = 0;
-	memset(tr.visClusters, -2, sizeof(tr.visClusters));	// force markleafs to regenerate
+	// force markleafs to regenerate
+	for(i = 0; i < MAX_VISCOUNTS; i++) {
+		tr.visClusters[i] = -2;
+	}
 
 	R_ClearFlares();
 	RE_ClearScene();