diff --git a/pkgs/applications/office/appflowy/default.nix b/pkgs/applications/office/appflowy/default.nix
index f3a7ea76c533..0790cb44d1f3 100644
--- a/pkgs/applications/office/appflowy/default.nix
+++ b/pkgs/applications/office/appflowy/default.nix
@@ -25,7 +25,8 @@ let
       };
       aarch64-darwin = x86_64-darwin;
     }
-    ."${stdenvNoCC.hostPlatform.system}";
+    ."${stdenvNoCC.hostPlatform.system}"
+      or (throw "appflowy: No source for system: ${stdenvNoCC.hostPlatform.system}");
 in
 stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "appflowy";