diff --git a/modules/database/src/ioc/rsrv/caservertask.c b/modules/database/src/ioc/rsrv/caservertask.c
index 7a9ae63b3..c51a06db6 100644
--- a/modules/database/src/ioc/rsrv/caservertask.c
+++ b/modules/database/src/ioc/rsrv/caservertask.c
@@ -1343,10 +1343,13 @@ void casExpandBuffer ( struct message_buffer *buf, ca_uint32_t size, int sendbuf
         // round up to multiple of 4K
         size = ((size-1)|0xfff)+1;
 
-        if (buf->type==mbtLargeTCP)
+        if (buf->type==mbtLargeTCP) {
             newbuf = realloc (buf->buf, size);
-        else
+            if(newbuf)
+                buf->buf = newbuf;
+        } else {
             newbuf = malloc (size);
+        }
         newtype = mbtLargeTCP;
         newsize = size;