diff --git a/test cases/python/2 extmodule/meson.build b/test cases/python/2 extmodule/meson.build
index 239492c44..8332afdd1 100644
--- a/test cases/python/2 extmodule/meson.build	
+++ b/test cases/python/2 extmodule/meson.build	
@@ -1,5 +1,5 @@
 project('Python extension module', 'c',
-  default_options : ['buildtype=release'])
+  default_options : ['buildtype=release', 'werror=true'])
 # Because Windows Python ships only with optimized libs,
 # we must build this project the same way.