diff --git a/sbin/growfs/growfs.c b/sbin/growfs/growfs.c
index 7b85b25329b8..5d13a3c82fc0 100644
--- a/sbin/growfs/growfs.c
+++ b/sbin/growfs/growfs.c
@@ -1331,7 +1331,7 @@ getdev(const char *name)
 		return (name);
 
 	cp = strrchr(name, '/');
-	if (cp == 0) {
+	if (cp == NULL) {
 		snprintf(device, sizeof(device), "%s%s", _PATH_DEV, name);
 		if (is_dev(device))
 			return (device);
diff --git a/sbin/newfs/newfs.c b/sbin/newfs/newfs.c
index 1f8e4d358fdf..0dbb786d5bd8 100644
--- a/sbin/newfs/newfs.c
+++ b/sbin/newfs/newfs.c
@@ -306,7 +306,7 @@ main(int argc, char *argv[])
 	if (!special[0])
 		err(1, "empty file/special name");
 	cp = strrchr(special, '/');
-	if (cp == 0) {
+	if (cp == NULL) {
 		/*
 		 * No path prefix; try prefixing _PATH_DEV.
 		 */
diff --git a/sbin/restore/utilities.c b/sbin/restore/utilities.c
index 89c2b09298c9..90bde98ce0d3 100644
--- a/sbin/restore/utilities.c
+++ b/sbin/restore/utilities.c
@@ -62,7 +62,7 @@ pathcheck(char *name)
 	char *start;
 
 	start = strchr(name, '/');
-	if (start == 0)
+	if (start == NULL)
 		return;
 	for (cp = start; *cp != '\0'; cp++) {
 		if (*cp != '/')