diff --git a/misc/ss.c b/misc/ss.c
index 6d59765..989e168 100644
--- a/misc/ss.c
+++ b/misc/ss.c
@@ -6228,7 +6228,7 @@
 		}
 		if (dump_tcpdiag[0] != '-') {
 			dump_fp = fopen(dump_tcpdiag, "w");
-			if (!dump_tcpdiag) {
+			if (!dump_fp) {
 				perror("fopen dump file");
 				exit(-1);
 			}