diff --git a/src/w_wad.c b/src/w_wad.c
index f8cb1561c..1d8a97c3c 100644
--- a/src/w_wad.c
+++ b/src/w_wad.c
@@ -156,7 +156,7 @@ typedef struct zlentry_s
 #endif
 
 // maximum length of longname
-#define MAXLUMPNAME 256
+#define MAXLUMPNAME 512
 
 // Available compression methods for lumps.
 typedef enum