diff --git a/route_linux.go b/route_linux.go
index 590e268..929738e 100644
--- a/route_linux.go
+++ b/route_linux.go
@@ -1157,7 +1157,7 @@ func (h *Handle) RouteListFiltered(family int, filter *Route, filterMask uint64)
 			continue
 		}
 		if msg.Table != unix.RT_TABLE_MAIN {
-			if filter == nil || filter != nil && filterMask&RT_FILTER_TABLE == 0 {
+			if filter == nil || filterMask&RT_FILTER_TABLE == 0 {
 				// Ignore non-main tables
 				continue
 			}