diff --git a/sys/libkern/strdup.c b/sys/libkern/strdup.c
--- a/sys/libkern/strdup.c
+++ b/sys/libkern/strdup.c
@@ -46,7 +46,7 @@
 	copy = malloc(len, type, flags);
 	if (copy == NULL)
 		return (NULL);
-	bcopy(string, copy, len);
+	memcpy(copy, string, len);
 	return (copy);
 }
 
diff --git a/sys/libkern/strndup.c b/sys/libkern/strndup.c
--- a/sys/libkern/strndup.c
+++ b/sys/libkern/strndup.c
@@ -42,7 +42,7 @@
 
 	len = strnlen(string, maxlen) + 1;
 	copy = malloc(len, type, M_WAITOK);
-	bcopy(string, copy, len);
+	memcpy(copy, string, len);
 	copy[len - 1] = '\0';
 	return (copy);
 }