diff --git a/pkgs/by-name/sd/SDL_ttf/package.nix b/pkgs/by-name/sd/SDL_ttf/package.nix
index bd40d331b9b9..2617f8e28eff 100644
--- a/pkgs/by-name/sd/SDL_ttf/package.nix
+++ b/pkgs/by-name/sd/SDL_ttf/package.nix
@@ -39,7 +39,7 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   configureFlags = [
-    (lib.enableFeature enableSdltest "-sdltest")
+    (lib.enableFeature enableSdltest "sdltest")
   ];
 
   strictDeps = true;