diff --git a/src/setup/mode.c b/src/setup/mode.c
index f8efdd71..350aedd8 100644
--- a/src/setup/mode.c
+++ b/src/setup/mode.c
@@ -182,7 +182,7 @@ static void OpenGameSelectDialog(GameSelectCallback callback)
             ++num_games;
         }
 
-        free(iwads);
+        free((void *)iwads);
     }
 
     TXT_AddWidget(window, TXT_NewStrut(0, 1));