diff --git a/modules/libcom/src/osi/os/posix/osdEvent.c b/modules/libcom/src/osi/os/posix/osdEvent.c
index db61c240b..b22a3430b 100644
--- a/modules/libcom/src/osi/os/posix/osdEvent.c
+++ b/modules/libcom/src/osi/os/posix/osdEvent.c
@@ -51,7 +51,7 @@ LIBCOM_API epicsEventId epicsEventCreate(epicsEventInitialState init)
     epicsEventId pevent = malloc(sizeof(*pevent));
 
     if (pevent) {
-        int status = osdPosixMutexInit(&pevent->mutex, 0);
+        int status = osdPosixMutexInit(&pevent->mutex, PTHREAD_MUTEX_DEFAULT);
 
         pevent->isFull = (init == epicsEventFull);
         if (status) {
diff --git a/modules/libcom/src/osi/os/posix/osdPosixMutexPriv.h b/modules/libcom/src/osi/os/posix/osdPosixMutexPriv.h
index 2b6846c91..87289be5f 100644
--- a/modules/libcom/src/osi/os/posix/osdPosixMutexPriv.h
+++ b/modules/libcom/src/osi/os/posix/osdPosixMutexPriv.h
@@ -18,7 +18,7 @@ extern "C" {
 #endif
 
 /* Returns ENOTSUP if requested mutextype is not supported */
-/* At the moment, only 0 (default non recursive mutex) and PTHREAD_MUTEX_RECURSIVE are supported */
+/* At the moment, only PTHREAD_MUTEX_DEFAULT and PTHREAD_MUTEX_RECURSIVE are supported */
 int osdPosixMutexInit(pthread_mutex_t *,int mutextype);
 
 #ifdef __cplusplus
diff --git a/modules/libcom/src/osi/os/posix/osdSpin.c b/modules/libcom/src/osi/os/posix/osdSpin.c
index f039e7c34..0b924ee3a 100644
--- a/modules/libcom/src/osi/os/posix/osdSpin.c
+++ b/modules/libcom/src/osi/os/posix/osdSpin.c
@@ -123,7 +123,7 @@ epicsSpinId epicsSpinCreate(void) {
     if (!spin)
         goto fail;
 
-    status = osdPosixMutexInit(&spin->lock, 0);
+    status = osdPosixMutexInit(&spin->lock, PTHREAD_MUTEX_DEFAULT);
     checkStatus(status, "osdPosixMutexInit");
     if (status)
         goto fail;
diff --git a/modules/libcom/src/osi/os/posix/osdThread.c b/modules/libcom/src/osi/os/posix/osdThread.c
index 45255881f..0eb5f5fd2 100644
--- a/modules/libcom/src/osi/os/posix/osdThread.c
+++ b/modules/libcom/src/osi/os/posix/osdThread.c
@@ -328,9 +328,9 @@ static void once(void)
     int status;
 
     pthread_key_create(&getpthreadInfo,0);
-    status = osdPosixMutexInit(&onceLock,0);
+    status = osdPosixMutexInit(&onceLock,PTHREAD_MUTEX_DEFAULT);
     checkStatusOnceQuit(status,"osdPosixMutexInit","epicsThreadInit");
-    status = osdPosixMutexInit(&listLock,0);
+    status = osdPosixMutexInit(&listLock,PTHREAD_MUTEX_DEFAULT);
     checkStatusOnceQuit(status,"osdPosixMutexInit","epicsThreadInit");
     pcommonAttr = calloc(1,sizeof(commonAttr));
     if(!pcommonAttr) checkStatusOnceQuit(errno,"calloc","epicsThreadInit");