diff --git a/NEWS b/NEWS
index a773fef64..e01dd3a01 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,5 @@
 ver 0.19.15 (not yet released)
+* fix more build failures on non-glibc builds due to constexpr Mutex
 
 ver 0.19.14 (2016/03/18)
 * decoder
diff --git a/src/notify.hxx b/src/notify.hxx
index 3e62a0103..c96390b8a 100644
--- a/src/notify.hxx
+++ b/src/notify.hxx
@@ -28,7 +28,7 @@ struct notify {
 	Cond cond;
 	bool pending;
 
-#if !defined(WIN32) && !defined(__NetBSD__) && !defined(__BIONIC__)
+#ifdef __GLIBC__
 	constexpr
 #endif
 	notify():pending(false) {}