diff --git a/pkgs/development/python-modules/Wand/default.nix b/pkgs/development/python-modules/Wand/default.nix
index 601a86ea2cf..cc958977b10 100644
--- a/pkgs/development/python-modules/Wand/default.nix
+++ b/pkgs/development/python-modules/Wand/default.nix
@@ -28,7 +28,9 @@ in buildPythonPackage rec {
   inherit magick_wand_library imagemagick_library;
 
   postPatch = ''
-    substituteAllInPlace wand/api.py
+    substituteInPlace wand/api.py --replace \
+      "magick_home = os.environ.get('MAGICK_HOME')" \
+      "magick_home = '${imagemagick}'"
   '';
 
   # tests not included with pypi release