diff --git a/src/content/mods.h b/src/content/mods.h
index 279ab1415..5e80b7c90 100644
--- a/src/content/mods.h
+++ b/src/content/mods.h
@@ -31,7 +31,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "config.h"
 #include "metadata.h"
 
-#define MODNAME_ALLOWED_CHARS "abcdefghijklmnopqrstuvwxyz0123456789_"
+#define MODNAME_ALLOWED_CHARS "abcdefghijklmnopqrstuvwxyz0123456789-_"
 
 struct ModSpec
 {