diff --git a/pkgs/tools/networking/slack-cli/default.nix b/pkgs/tools/networking/slack-cli/default.nix
index 55396f16cb0..2e20fbe2c3c 100644
--- a/pkgs/tools/networking/slack-cli/default.nix
+++ b/pkgs/tools/networking/slack-cli/default.nix
@@ -20,8 +20,8 @@ stdenv.mkDerivation rec {
   dontBuild = true;
 
   installPhase = ''
-    mkdir -p $out/bin
-    cp src/slack $out/bin
-    wrapProgram $out/bin/slack --prefix PATH : ${lib.makeBinPath [ curl jq ]}
+    mkdir -p "$out/bin"
+    cp src/slack "$out/bin"
+    wrapProgram "$out/bin/slack" --prefix PATH : ${lib.makeBinPath [ curl jq ]}
   '';
 }