diff --git a/src/Stack/Nix.hs b/src/Stack/Nix.hs
index 066948c579..460dc23f13 100644
--- a/src/Stack/Nix.hs
+++ b/src/Stack/Nix.hs
@@ -74,7 +74,7 @@ runShellAndExit mprojectRoot getCompilerVersion getCmdArgs = do
      inContainer <- getInContainer
      ghc <- either throwIO return $ nixCompiler compilerVersion
      let pkgsInConfig = nixPackages (configNix config)
-         pkgs = pkgsInConfig ++ [ghc, "git", "gcc"]
+         pkgs = pkgsInConfig ++ [ghc, "git", "gcc", "gmp"]
          pkgsStr = "[" <> T.intercalate " " pkgs <> "]"
          pureShell = nixPureShell (configNix config)
          addGCRoots = nixAddGCRoots (configNix config)
diff --git a/stack.yaml b/stack.yaml
index 8afd1a3a05..57ce744ebb 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -12,6 +12,7 @@ nix:
   enable: false
   packages:
     - zlib
+    - unzip
 flags:
   stack:
     hide-dependency-versions: true