diff --git a/pkgs/development/python-modules/bash_kernel/default.nix b/pkgs/development/python-modules/bash_kernel/default.nix
index f35d8fae690..b7f508cdda2 100644
--- a/pkgs/development/python-modules/bash_kernel/default.nix
+++ b/pkgs/development/python-modules/bash_kernel/default.nix
@@ -4,6 +4,7 @@
 , fetchpatch
 , ipykernel
 , isPy27
+, python
 , pexpect
 }:
 buildPythonPackage rec {
@@ -35,7 +36,7 @@ buildPythonPackage rec {
   '';
 
   postInstall = ''
-    python -m bash_kernel.install --prefix $out
+    ${python.interpreter} -m bash_kernel.install --prefix $out
   '';
 
   meta = {