diff --git a/include/compat/pthread.h b/include/compat/pthread.h
index 8b8c3c6..b2a42a6 100644
--- a/include/compat/pthread.h
+++ b/include/compat/pthread.h
@@ -15,6 +15,11 @@
  */
 #define PTHREAD_ONCE_INIT   { INIT_ONCE_STATIC_INIT }
 
+/*
+ * Static mutex initialization values.
+ */
+#define PTHREAD_MUTEX_INITIALIZER	{ 0, 0, 0, 0, 0, 0 }
+
 /*
  * Once definitions.
  */