diff --git a/meson.build b/meson.build
index 2b1e1d02..8d31f5c7 100644
--- a/meson.build
+++ b/meson.build
@@ -45,6 +45,7 @@ endif
 if cc_id == 'mvsc'
 
   has_c99_var_decl = cc_version.version_compare('>=18')
+  c_args += '-W3'
 
 elif cc_id == 'clang'