diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 5e3046878d0..fe3dff69c04 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -40217,17 +40217,19 @@ e.g. filters, callbacks and errbacks can all be promises.")
     (arguments
      (list
       #:test-flags
-      #~(list "-k" (string-join
-                    (list
-                     ;; These tests require Internet access.
-                     "not test_seed_link_via_app_data"
-                     ;; AssertionError: assert 'python' in ['python3',
-                     ;; 'python3.11'].
-                     ;;
-                     ;; PythonInfo() returns: 'system_executable':
-                     ;; '/gnu/store/...-python-wrapper-3.11.11/bin/python'
-                     "test_fallback_existent_system_executable")
-                    " and not "))))
+      #~(list "-k"
+              (string-join
+               (list
+                ;; AssertionError: assert 'python' in ['python3', 'python3.11'].
+                "not test_seed_link_via_app_data"
+                ;;
+                ;; These tests require Internet access.
+                "test_build_c_ext.py"
+                ;;
+                ;; PythonInfo() returns: 'system_executable':
+                ;; '/gnu/store/...-python-wrapper-3.11.11/bin/python'
+                "test_fallback_existent_system_executable")
+               " and not "))))
     (native-inputs
      (list python-flaky
            python-hatch-vcs