diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
index e9176eba9..ce043bb47 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.cpp
@@ -18,7 +18,7 @@
 #include "osiThread.h"
 #include "ipAddrToAsciiAsynchronous.h"
 
-osiMutex ipAddrToAsciiEngine::mutex;
+epicsMutex ipAddrToAsciiEngine::mutex;
 
 ipAddrToAsciiEngine::ipAddrToAsciiEngine ( const char *pName ) :
     osiThread ( pName, 0x1000, threadPriorityLow ), nextId ( 0u ),
diff --git a/src/libCom/misc/ipAddrToAsciiAsynchronous.h b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
index ad02c8bdb..f6118306f 100644
--- a/src/libCom/misc/ipAddrToAsciiAsynchronous.h
+++ b/src/libCom/misc/ipAddrToAsciiAsynchronous.h
@@ -17,7 +17,7 @@
 #ifndef ipAddrToAsciiAsynchronous_h
 #define ipAddrToAsciiAsynchronous_h
 
-#include "osiEvent.h"
+#include "epicsMutex.h"
 #include "osiSock.h"
 #include "tsDLList.h"
 #include "shareLib.h"
@@ -38,7 +38,7 @@ private:
     char nameTmp [1024];
     unsigned nextId;
     bool exitFlag;
-    static osiMutex mutex;
+    static epicsMutex mutex;
     void entryPoint ();
     friend class ipAddrToAsciiAsynchronous;
 };