diff --git a/meson.build b/meson.build
index 11c291535..87c798bed 100644
--- a/meson.build
+++ b/meson.build
@@ -11,6 +11,7 @@ release_date = '2025-12-21'
 add_project_arguments('-DHAVE_DIX_CONFIG_H', language: ['c', 'objc'])
 cc = meson.get_compiler('c')
 
+add_project_arguments('-pedantic', language : 'c')
 add_project_arguments('-fno-strict-aliasing', language : 'c')
 add_project_arguments('-fvisibility=hidden', language : 'c')
 add_project_arguments('-Wvla', language: 'c')
@@ -38,6 +39,7 @@ conf_data.set('_DIX_CONFIG_H_', '1')
 
 if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
     test_wflags = [
+        '-pedantic',
         '-Wall',
         '-Wchar-subscripts',
         '-Wpointer-arith',