diff --git a/src/cas/generic/casInternal.h b/src/cas/generic/casInternal.h
index 9198e450a..a43c7b2b4 100644
--- a/src/cas/generic/casInternal.h
+++ b/src/cas/generic/casInternal.h
@@ -166,7 +166,8 @@ public:
 		return this->ciu;
 	}
     void * operator new ( size_t size, 
-        tsFreeList < casMonitor, 1024 > & );
+        tsFreeList < casMonitor, 1024 > & ) 
+            epicsThrows ( (std::bad_alloc) );
     epicsPlacementDeleteOperator (( void *, 
         tsFreeList < casMonitor, 1024 > & ))