diff --git a/pkgs/tools/virtualization/google-compute-engine/default.nix b/pkgs/tools/virtualization/google-compute-engine/default.nix
index bd766d7c5a9f..4621fe8f1567 100644
--- a/pkgs/tools/virtualization/google-compute-engine/default.nix
+++ b/pkgs/tools/virtualization/google-compute-engine/default.nix
@@ -7,6 +7,7 @@
 , utillinux
 , boto
 , setuptools
+, mock
 }:
 
 buildPythonApplication rec {
@@ -21,6 +22,8 @@ buildPythonApplication rec {
     sha256 = "0hlzcrf6yhzan25f4wzy1vbncak9whhqzrzza026ly3sq0smmjpg";
   };
 
+  buildInputs = [ mock ];
+
   postPatch = ''
     for file in $(find google_compute_engine -type f); do
       substituteInPlace "$file" \