diff --git a/src/ca/tcpiiu.cpp b/src/ca/tcpiiu.cpp
index 7688d8987..507558969 100644
--- a/src/ca/tcpiiu.cpp
+++ b/src/ca/tcpiiu.cpp
@@ -26,6 +26,7 @@
 
 #define epicsAssertAuthor "Jeff Hill johill@lanl.gov"
 
+#include <stdexcept>
 #include <string>
 #include "errlog.h"
 
@@ -43,6 +44,8 @@
 #include "caerr.h"
 #include "udpiiu.h"
 
+using namespace std;
+
 const unsigned mSecPerSec = 1000u;
 const unsigned uSecPerSec = 1000u * mSecPerSec;
 
@@ -703,7 +706,7 @@ tcpiiu::tcpiiu (
             "CAC: TCP circuit creation failure because \"";
         reason += sockErrBuf;
         reason += "\"";
-        throw std :: runtime_error ( reason );
+        throw runtime_error ( reason );
     }
 
     int flag = true;
diff --git a/src/libCom/osi/epicsThread.cpp b/src/libCom/osi/epicsThread.cpp
index f4ee1f330..9e5cfd56a 100644
--- a/src/libCom/osi/epicsThread.cpp
+++ b/src/libCom/osi/epicsThread.cpp
@@ -28,12 +28,14 @@
 #include "epicsGuard.h"
 #include "errlog.h"
 
+using namespace std;
+
 epicsThreadRunable::~epicsThreadRunable () {}
 void epicsThreadRunable::run () {}
 void epicsThreadRunable::show ( unsigned int ) const {}
 
 class epicsThread :: unableToCreateThread : 
-    public std :: exception {
+    public exception {
 public:
     const char * what () const throw ();
 };