diff --git a/xen/common/argo.c b/xen/common/argo.c
index 5da14c929e..ffa1f43437 100644
--- a/xen/common/argo.c
+++ b/xen/common/argo.c
@@ -1467,7 +1467,7 @@ find_ring_mfns(struct domain *d, struct argo_ring_info *ring_info,
     if ( ring_info->mfns )
     {
         /* Ring already existed: drop the previous mapping. */
-        argo_dprintk("argo: vm%u re-register existing ring "
+        argo_dprintk("vm%u re-register existing ring "
                      "(vm%u:%x vm%u) clears mapping\n",
                      d->domain_id, ring_info->id.domain_id,
                      ring_info->id.aport, ring_info->id.partner_id);
@@ -1527,7 +1527,7 @@ find_ring_mfns(struct domain *d, struct argo_ring_info *ring_info,
     {
         ASSERT(ring_info->nmfns == NPAGES_RING(len));
 
-        argo_dprintk("argo: vm%u ring (vm%u:%x vm%u) %p "
+        argo_dprintk("vm%u ring (vm%u:%x vm%u) %p "
                      "mfn_mapping %p len %u nmfns %u\n",
                      d->domain_id, ring_info->id.domain_id,
                      ring_info->id.aport, ring_info->id.partner_id, ring_info,
@@ -1741,7 +1741,7 @@ register_ring(struct domain *currd,
         list_add(&ring_info->node,
                  &currd->argo->ring_hash[hash_index(&ring_info->id)]);
 
-        argo_dprintk("argo: vm%u registering ring (vm%u:%x vm%u)\n",
+        argo_dprintk("vm%u registering ring (vm%u:%x vm%u)\n",
                      currd->domain_id, ring_id.domain_id, ring_id.aport,
                      ring_id.partner_id);
     }
@@ -1781,7 +1781,7 @@ register_ring(struct domain *currd,
             goto out_unlock2;
         }
 
-        argo_dprintk("argo: vm%u re-registering existing ring (vm%u:%x vm%u)\n",
+        argo_dprintk("vm%u re-registering existing ring (vm%u:%x vm%u)\n",
                      currd->domain_id, ring_id.domain_id, ring_id.aport,
                      ring_id.partner_id);
     }