diff --git a/quake/src/WinQuake/net_dgrm.cpp b/quake/src/WinQuake/net_dgrm.cpp
index 6b9b38a..0d807ce 100644
--- a/quake/src/WinQuake/net_dgrm.cpp
+++ b/quake/src/WinQuake/net_dgrm.cpp
@@ -126,7 +126,7 @@
 		    ulongaddr addrTemp;
 		    addrTemp.ul = banAddr;
 		    ulongaddr maskTemp;
-		    maskTemp.ul - banMask;
+		    maskTemp.ul = banMask;
 
 			if (addrTemp.addr.s_addr)
 			{