diff --git a/src/db/dbChannelIO.cpp b/src/db/dbChannelIO.cpp
index d892475f6..18dc852c7 100644
--- a/src/db/dbChannelIO.cpp
+++ b/src/db/dbChannelIO.cpp
@@ -135,6 +135,13 @@ void * dbChannelIO::operator new ( size_t size,
     return freeList.allocate ( size );
 }
 
+void * dbChannelIO::operator new ( size_t ) // X aCC 361
+{
+    // The HPUX compiler seems to require this even though no code
+    // calls it directly
+    throw std::logic_error ( "why is the compiler calling private operator new" );
+}
+
 #ifdef CXX_PLACEMENT_DELETE
 void dbChannelIO::operator delete ( void *pCadaver, 
     tsFreeList < dbChannelIO > & freeList ) epicsThrows(())
diff --git a/src/db/dbPutNotifyBlocker.cpp b/src/db/dbPutNotifyBlocker.cpp
index 27e4dab1b..c953f7b76 100644
--- a/src/db/dbPutNotifyBlocker.cpp
+++ b/src/db/dbPutNotifyBlocker.cpp
@@ -188,6 +188,13 @@ void * dbPutNotifyBlocker::operator new ( size_t size,
     return freeList.allocate ( size );
 }
 
+void * dbPutNotifyBlocker::operator new ( size_t ) // X aCC 361
+{
+    // The HPUX compiler seems to require this even though no code
+    // calls it directly
+    throw std::logic_error ( "why is the compiler calling private operator new" );
+}
+
 #ifdef CXX_PLACEMENT_DELETE
 void dbPutNotifyBlocker::operator delete ( void *pCadaver, 
     tsFreeList < dbPutNotifyBlocker > & freeList ) epicsThrows(())
diff --git a/src/db/dbSubscriptionIO.cpp b/src/db/dbSubscriptionIO.cpp
index 3d754d4c3..56c92640e 100644
--- a/src/db/dbSubscriptionIO.cpp
+++ b/src/db/dbSubscriptionIO.cpp
@@ -74,6 +74,13 @@ void dbSubscriptionIO::channelDeleteException ()
         this->chan.pName(), this->type, this->count );
 }
 
+void * dbSubscriptionIO::operator new ( size_t ) // X aCC 361
+{
+    // The HPUX compiler seems to require this even though no code
+    // calls it directly
+    throw std::logic_error ( "why is the compiler calling private operator new" );
+}
+
 void dbSubscriptionIO::operator delete ( void * )
 {
     // Visual C++ .net appears to require operator delete if