diff --git a/pkgs/development/python-modules/weasyprint/default.nix b/pkgs/development/python-modules/weasyprint/default.nix
index 5ec5c5997706..71ae956d6df8 100644
--- a/pkgs/development/python-modules/weasyprint/default.nix
+++ b/pkgs/development/python-modules/weasyprint/default.nix
@@ -79,6 +79,11 @@ buildPythonPackage rec {
 
   FONTCONFIG_FILE = "${fontconfig.out}/etc/fonts/fonts.conf";
 
+  # Fontconfig error: Cannot load default config file: No such file: (null)
+  makeWrapperArgs = [
+    "--set FONTCONFIG_FILE ${FONTCONFIG_FILE}"
+  ];
+
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace "--isort --flake8 --cov --no-cov-on-fail" ""