diff --git a/source/gl_rsurf.c b/source/gl_rsurf.c
index 0bfa3ba..06efc1a 100644
--- a/source/gl_rsurf.c
+++ b/source/gl_rsurf.c
@@ -235,29 +235,19 @@ R_BuildLightMap (msurface_t *surf, byte * dest, int stride)
 
 	// set to full bright if no light data
 	if (!cl.worldmodel->lightdata) {
-		bl = blocklights;
-		for (i = 0; i < size; i++) {
-			*bl++ = 255 << 8;
-			*bl++ = 255 << 8;
-			*bl++ = 255 << 8;
-		}
+		memset (&blocklights[0], 255, size * 3 * sizeof (unsigned int));
 		goto store;
 	}
 	// clear to no light
-	bl = blocklights;
-	for (i = 0; i < size; i++) {
-		*bl++ = 0;
-		*bl++ = 0;
-		*bl++ = 0;
-	}
-	bl = blocklights;
+
+	memset (&blocklights[0], 0, size * 3 * sizeof (unsigned int));
 
 	// add all the lightmaps
 	if (lightmap) {
 		for (maps = 0; maps < MAXLIGHTMAPS && surf->styles[maps] != 255; maps++) {
 			scale = d_lightstylevalue[surf->styles[maps]];
 			surf->cached_light[maps] = scale;	// 8.8 fraction
-			bl = blocklights;
+			bl=blocklights;
 			for (i = 0; i < size; i++) {
 				*bl++ += *lightmap++ * scale;
 				*bl++ += *lightmap++ * scale;