diff --git a/src/world/sprite.c b/src/world/sprite.c
index bfaee350b9..6b282945c5 100644
--- a/src/world/sprite.c
+++ b/src/world/sprite.c
@@ -205,7 +205,7 @@ const char * sprite_checksum()
 }
 #else
 
-char * sprite_checksum()
+const char * sprite_checksum()
 {
 	return NULL;
 }