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Diffstat (limited to 'lib/dpif-netdev.c')
-rw-r--r--lib/dpif-netdev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 4ff1a425f..d8f5ba73c 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -160,7 +160,7 @@ get_dp_netdev(const struct dpif *dpif)
static int
name_to_dp_idx(const char *name)
{
- if (!strncmp(name, "dp", 2) && isdigit(name[2])) {
+ if (!strncmp(name, "dp", 2) && isdigit((unsigned char)name[2])) {
int dp_idx = atoi(name + 2);
if (dp_idx >= 0 && dp_idx < N_DP_NETDEVS) {
return dp_idx;