diff --git a/src/server/gdb_server.c b/src/server/gdb_server.c
index 74dec63c8..222af47a0 100644
--- a/src/server/gdb_server.c
+++ b/src/server/gdb_server.c
@@ -2410,7 +2410,7 @@ static int gdb_target_add_one(struct target *target)
 		 * then we increment the port number for the next target.
 		 */
 		char *end;
-		strtol(gdb_port_next, &end, 0);
+		portnumber = strtol(gdb_port_next, &end, 0);
 		if (!*end)
 		{
 			if (parse_long(gdb_port_next, &portnumber) == ERROR_OK)
diff --git a/src/server/server.c b/src/server/server.c
index 01d91d30f..1feb744b4 100644
--- a/src/server/server.c
+++ b/src/server/server.c
@@ -200,7 +200,7 @@ int add_service(char *name, const char *port, int max_connections, new_connectio
 	} else
 	{
 		char *end;
-		strtol(c->port, &end, 0);
+		portnumber = strtol(c->port, &end, 0);
 		if (!*end && (parse_long(c->port, &portnumber) == ERROR_OK))
 		{
 			c->portnumber = portnumber;