diff --git a/src/libCom/test/epicsEventTest.cpp b/src/libCom/test/epicsEventTest.cpp
index 7fcc6c697..e664d7281 100644
--- a/src/libCom/test/epicsEventTest.cpp
+++ b/src/libCom/test/epicsEventTest.cpp
@@ -129,7 +129,8 @@ static void eventWaitTest()
 {
     double errorSum = 0.0;
     epicsEventId event = epicsEventMustCreate ( epicsEventEmpty );
-    for ( int i = 0u; i < 20; i++ ) {
+    int i;
+    for ( i = 0u; i < 20; i++ ) {
         double delay = ldexp ( 1.0 , -i );
         errorSum += eventWaitMeasureDelayError ( event, delay );
     }
diff --git a/src/libCom/test/epicsThreadTest.cpp b/src/libCom/test/epicsThreadTest.cpp
index f253a373a..9381a1ce4 100644
--- a/src/libCom/test/epicsThreadTest.cpp
+++ b/src/libCom/test/epicsThreadTest.cpp
@@ -70,7 +70,8 @@ static double threadSleepMeasureDelayError( const double & delay )
 static void threadSleepTest()
 {
     double errorSum = 0.0;
-    for ( int i = 0u; i < 20; i++ ) {
+    int i;
+    for ( i = 0u; i < 20; i++ ) {
         double delay = ldexp ( 1.0 , -i );
         errorSum += threadSleepMeasureDelayError ( delay );
     }