diff --git a/usr.sbin/ppp/command.c b/usr.sbin/ppp/command.c
index c7b36899ffac..d805fcb8e708 100644
--- a/usr.sbin/ppp/command.c
+++ b/usr.sbin/ppp/command.c
@@ -1717,6 +1717,8 @@ SetVariable(struct cmdargs const *arg)
     break;
 
   case VAR_MRU:
+    long_val = 0;	/* silence gcc */
+    change = NULL;	/* silence gcc */
     switch(arg->argc - arg->argn) {
     case 1:
       if (argp[strspn(argp, "0123456789")] != '\0') {
@@ -1772,6 +1774,8 @@ SetVariable(struct cmdargs const *arg)
     break;
 
   case VAR_MTU:
+    long_val = 0;	/* silence gcc */
+    change = NULL;	/* silence gcc */
     switch(arg->argc - arg->argn) {
     case 1:
       if (argp[strspn(argp, "0123456789")] != '\0') {