diff --git a/vlib/v/builder/cc.v b/vlib/v/builder/cc.v
index d3f6e54642..fae4c06173 100644
--- a/vlib/v/builder/cc.v
+++ b/vlib/v/builder/cc.v
@@ -302,6 +302,7 @@ fn (mut v Builder) setup_ccompiler_options(ccompiler string) {
 		// have much better performance when NDEBUG is defined
 		// See also http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf
 		ccoptions.args << '-DNDEBUG'
+		ccoptions.args << '-DNO_DEBUGGING' // for BDWGC
 	}
 	if v.pref.sanitize {
 		ccoptions.args << '-fsanitize=leak'
diff --git a/vlib/v/builder/msvc_windows.v b/vlib/v/builder/msvc_windows.v
index efabe1048f..1685613ade 100644
--- a/vlib/v/builder/msvc_windows.v
+++ b/vlib/v/builder/msvc_windows.v
@@ -291,6 +291,7 @@ pub fn (mut v Builder) cc_msvc() {
 	} else {
 		a << '/MD'
 		a << '/DNDEBUG'
+		a << '/DNO_DEBUGGING'
 		if !v.ccoptions.debug_mode {
 			v.pref.cleanup_files << out_name_pdb
 			v.pref.cleanup_files << app_dir_out_name + '.pdb'
@@ -458,6 +459,7 @@ fn (mut v Builder) build_thirdparty_obj_file_with_msvc(_mod string, path string,
 			oargs << '/O2'
 			oargs << '/MD'
 			oargs << '/DNDEBUG'
+			oargs << '/DNO_DEBUGGING'
 		}
 	} else {
 		oargs << '/MDd'