diff --git a/light/ltface.c b/light/ltface.c
index 2a2d705f..cda69b86 100644
--- a/light/ltface.c
+++ b/light/ltface.c
@@ -893,6 +893,18 @@ Lightmap_ForStyle(lightmap_t *lightmaps, const int style, const lightsurf_t *lig
     return lightmap;
 }
 
+/*
+ * Lightmap_ClearAll
+ * 
+ * Sets all styles to 255, doesn't actually clear the data.
+ */
+void Lightmap_ClearAll(lightmap_t *lightmaps)
+{
+    for (int i = 0; i <= MAXLIGHTMAPS; i++) {
+        lightmaps[i].style = 255;
+    }
+}
+
 /*
  * Lightmap_Save
  *