diff --git a/pkgs/development/compilers/emscripten/default.nix b/pkgs/development/compilers/emscripten/default.nix
index 6757fbcfd17c..adac56501409 100644
--- a/pkgs/development/compilers/emscripten/default.nix
+++ b/pkgs/development/compilers/emscripten/default.nix
@@ -2,7 +2,6 @@
   lib,
   stdenv,
   fetchFromGitHub,
-  fetchpatch,
   python3,
   nodejs,
   closurecompiler,
@@ -51,10 +50,14 @@ stdenv.mkDerivation rec {
     rev = version;
   };
 
-  nativeBuildInputs = [ makeWrapper ];
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    makeWrapper
+    python3
+  ];
   buildInputs = [
     nodejs
-    python3
   ];
 
   patches = [