diff --git a/src/net.cpp b/src/net.cpp
index e3c0f8c3d18..c353473a7e2 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1107,11 +1107,11 @@ void ThreadMapPort2(void* parg)
 #ifndef UPNPDISCOVER_SUCCESS
     /* miniupnpc 1.5 */
         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
-	                        port, port, lanaddr, strDesc.c_str(), "TCP", 0);
+                            port, port, lanaddr, strDesc.c_str(), "TCP", 0);
 #else
     /* miniupnpc 1.6 */
         r = UPNP_AddPortMapping(urls.controlURL, data.first.servicetype,
-	                        port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
+                            port, port, lanaddr, strDesc.c_str(), "TCP", 0, "0");
 #endif
 
         if(r!=UPNPCOMMAND_SUCCESS)