diff --git a/pkgs/by-name/es/espflash/package.nix b/pkgs/by-name/es/espflash/package.nix
index e14ce6f033be..eb5f9cad400a 100644
--- a/pkgs/by-name/es/espflash/package.nix
+++ b/pkgs/by-name/es/espflash/package.nix
@@ -33,7 +33,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
   cargoHash = "sha256-Vgf3k0pT8VswESXuWIIeZlCFLm861BYrteRFkmhk/3M=";
 
   cargoBuildFlags = [
-    "--exclude xtask"
+    "--exclude=xtask"
     "--workspace"
   ];