diff --git a/pkgs/by-name/sa/sandbox-runtime/package.nix b/pkgs/by-name/sa/sandbox-runtime/package.nix
index c5455d952375..a3491cfb2029 100644
--- a/pkgs/by-name/sa/sandbox-runtime/package.nix
+++ b/pkgs/by-name/sa/sandbox-runtime/package.nix
@@ -50,7 +50,7 @@ buildNpmPackage (finalAttrs: {
     in
     ''
       wrapProgram $out/bin/srt \
-        --prefix PATH ${lib.makeBinPath runtimeDeps}
+        --prefix PATH : ${lib.makeBinPath runtimeDeps}
     '';
 
   nativeInstallCheckInputs = [