diff --git a/epan/addr_resolv.c b/epan/addr_resolv.c
index 7ad0478601..ff4dc02cf3 100644
--- a/epan/addr_resolv.c
+++ b/epan/addr_resolv.c
@@ -3198,7 +3198,7 @@ eui64_to_display(wmem_allocator_t *allocator, const guint64 addr_eui64)
 
     manuf_value = manuf_name_lookup(addr);
     if (!gbl_resolv_flags.mac_name || (manuf_value->status == HASHETHER_STATUS_UNRESOLVED)) {
-        return wmem_strdup_printf(allocator, "%02x:%02x:%02x%02x:%02x:%02x%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
+        return wmem_strdup_printf(allocator, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5], addr[6], addr[7]);
     }
     return wmem_strdup_printf(allocator, "%s_%02x:%02x:%02x:%02x:%02x", manuf_value->resolved_name, addr[3], addr[4], addr[5], addr[6], addr[7]);