diff --git a/tools/quake3/q3map2/light_bounce.c b/tools/quake3/q3map2/light_bounce.c
index dba5b131..6d7c54fc 100644
--- a/tools/quake3/q3map2/light_bounce.c
+++ b/tools/quake3/q3map2/light_bounce.c
@@ -836,6 +836,9 @@ void RadLight( int num )
 	/* find nodraw bit */
 	contentFlags = surfaceFlags = compileFlags = 0;
 	ApplySurfaceParm( "nodraw", &contentFlags, &surfaceFlags, &compileFlags );
+
+	// jal : avoid bouncing on trans surfaces
+	ApplySurfaceParm( "trans", &contentFlags, &surfaceFlags, &compileFlags );
 	
 	/* early outs? */
 	if( scale <= 0.0f || (si->compileFlags & C_SKY) || si->autosprite ||