diff --git a/phc2sys.c b/phc2sys.c
index 21cae75..15f8d75 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -138,7 +138,7 @@ static int run_pmc_port_properties(struct node *node, int timeout,
 static clockid_t clock_open(char *device, int *phc_index)
 {
 	struct sk_ts_info ts_info;
-	char phc_device[16];
+	char phc_device[19];
 	int clkid;
 
 	/* check if device is CLOCK_REALTIME */
diff --git a/phc_ctl.c b/phc_ctl.c
index a4daa4e..4a78a19 100644
--- a/phc_ctl.c
+++ b/phc_ctl.c
@@ -113,7 +113,7 @@ static int64_t calculate_offset(struct timespec *ts1,
 static clockid_t clock_open(char *device)
 {
 	struct sk_ts_info ts_info;
-	char phc_device[16];
+	char phc_device[19];
 	int clkid;
 
 	/* check if device is CLOCK_REALTIME */