diff --git a/pvAccessApp/ca/caConstants.h b/pvAccessApp/ca/caConstants.h
index 5ab07ef..906c9b4 100644
--- a/pvAccessApp/ca/caConstants.h
+++ b/pvAccessApp/ca/caConstants.h
@@ -32,7 +32,7 @@ namespace epics {
         const int8 CA_UNKNOWN_MINOR_PROTOCOL_REVISION = 0;
 
         /** CA version signature (e.g. 0x50). */
-        const int8 CA_VERSION = ((unsigned int8)CA_MAJOR_PROTOCOL_REVISION<<4)|CA_MINOR_PROTOCOL_REVISION;
+        const int8 CA_VERSION = ((uint8_t)CA_MAJOR_PROTOCOL_REVISION<<4)|CA_MINOR_PROTOCOL_REVISION;
 
         /** CA protocol port base. */
         const int32 CA_PORT_BASE = 5056;
diff --git a/pvAccessApp/remote/blockingTCPTransport.cpp b/pvAccessApp/remote/blockingTCPTransport.cpp
index 8e2d736..124530d 100644
--- a/pvAccessApp/remote/blockingTCPTransport.cpp
+++ b/pvAccessApp/remote/blockingTCPTransport.cpp
@@ -554,7 +554,7 @@ namespace epics {
                         // second byte version - major/minor nibble
                         int8 magic = _socketBuffer->getByte();
                         _version = _socketBuffer->getByte();
-                        if((magic != CA_MAGIC) || (((unsigned int8)_version) >> 4)!=CA_MAJOR_PROTOCOL_REVISION)
+                        if((magic != CA_MAGIC) || (((uint8_t)_version) >> 4)!=CA_MAJOR_PROTOCOL_REVISION)
                         {
                             // error... disconnect
                             LOG(
diff --git a/pvAccessApp/remote/blockingUDPTransport.cpp b/pvAccessApp/remote/blockingUDPTransport.cpp
index 75955cc..342572a 100644
--- a/pvAccessApp/remote/blockingUDPTransport.cpp
+++ b/pvAccessApp/remote/blockingUDPTransport.cpp
@@ -263,7 +263,7 @@ namespace epics {
                 // second byte version - major/minor nibble
                 int8 magic = receiveBuffer->getByte();
                 int8 version = receiveBuffer->getByte();
-                if((magic != CA_MAGIC) || (((unsigned int8)version) >> 4)!=CA_MAJOR_PROTOCOL_REVISION)
+                if((magic != CA_MAGIC) || (((uint8_t)version) >> 4)!=CA_MAJOR_PROTOCOL_REVISION)
                     return false;
 
                 // only data for UDP