diff --git a/src/ca/acctst.c b/src/ca/acctst.c
index 9fdeebf95..2d7554151 100644
--- a/src/ca/acctst.c
+++ b/src/ca/acctst.c
@@ -2180,7 +2180,7 @@ void monitorUpdateTest ( chid chan, unsigned interestLevel )
 
     for ( i = 0; i < NELEMENTS(test); i++ ) {
         test[i].count = 0;
-        test[i].lastValue = -1.0;
+        test[i].lastValue = -1.0f;
         SEVCHK(ca_add_event(DBR_GR_FLOAT, chan, updateTestEvent,
             &test[i], &test[i].id),NULL);
     }
@@ -2235,7 +2235,7 @@ void monitorUpdateTest ( chid chan, unsigned interestLevel )
         for ( j = 0; j < NELEMENTS(test); j++ ) {
             SEVCHK ( ca_clear_event ( test[j].id ), NULL );
             test[j].count = 0;
-            test[j].lastValue = -1.0;
+            test[j].lastValue = -1.0f;
             SEVCHK ( ca_add_event ( DBR_GR_FLOAT, chan, updateTestEvent,
                 &test[j], &test[j].id ) , NULL );
         } 
diff --git a/src/ca/comQueRecv.cpp b/src/ca/comQueRecv.cpp
index 79b813864..db797fd65 100644
--- a/src/ca/comQueRecv.cpp
+++ b/src/ca/comQueRecv.cpp
@@ -178,7 +178,7 @@ epicsUInt8 comQueRecv::popUInt8 ()
     if ( ! pComBuf ) {
         comBuf::throwInsufficentBytesException ();
     }
-    epicsUInt8 tmp = 0;
+    epicsUInt8 tmp = '\0';
     comBuf::popStatus status = pComBuf->pop ( tmp );
     if ( ! status.success ) {
         comBuf::throwInsufficentBytesException ();
@@ -197,7 +197,7 @@ epicsUInt16 comQueRecv::popUInt16 ()
         comBuf::throwInsufficentBytesException ();
     }
     // try first for all in one buffer efficent version
-    epicsUInt16 tmp;
+    epicsUInt16 tmp = 0;
     comBuf::popStatus status = pComBuf->pop ( tmp );
     if ( status.success ) {
         this->nBytesPending -= sizeof ( epicsUInt16 );
@@ -216,7 +216,7 @@ epicsUInt32 comQueRecv::popUInt32 ()
         comBuf::throwInsufficentBytesException ();
     }
     // try first for all in one buffer efficent version
-    epicsUInt32 tmp;
+    epicsUInt32 tmp = 0;
     comBuf::popStatus status = pComBuf->pop ( tmp );
     if ( status.success ) {
         this->nBytesPending -= sizeof ( epicsUInt32 );
diff --git a/src/ca/tcpiiu.cpp b/src/ca/tcpiiu.cpp
index 4d8d8e787..dafedab2c 100644
--- a/src/ca/tcpiiu.cpp
+++ b/src/ca/tcpiiu.cpp
@@ -1555,9 +1555,9 @@ void tcpiiu::subscriptionRequest (
         CA_V49 ( this->minorProtocolVersion ) );
 
     // extension
-    this->sendQue.pushFloat32 ( 0.0 ); // m_lval
-    this->sendQue.pushFloat32 ( 0.0 ); // m_hval
-    this->sendQue.pushFloat32 ( 0.0 ); // m_toval
+    this->sendQue.pushFloat32 ( 0.0f ); // m_lval
+    this->sendQue.pushFloat32 ( 0.0f ); // m_hval
+    this->sendQue.pushFloat32 ( 0.0f ); // m_toval
     this->sendQue.pushUInt16 ( static_cast < ca_uint16_t > ( mask ) ); // m_mask
     this->sendQue.pushUInt16 ( 0u ); // m_pad
     minder.commit ();