diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 1e8e3ba..7b234e3 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -40,30 +40,30 @@ static Hashmap *arg_disks = NULL;
 static char *arg_default_options = NULL;
 static char *arg_default_keyfile = NULL;
 
-static int split_keyspec(const char *keyspec, char **keyfile, char **keydev) {
-        _cleanup_free_ char *kfile = NULL, *kdev = NULL;
-        char *c;
+static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_keydev) {
+        _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
+        const char *c;
 
         assert(keyspec);
-        assert(keyfile);
-        assert(keydev);
+        assert(ret_keyfile);
+        assert(ret_keydev);
 
         c = strrchr(keyspec, ':');
         if (c) {
-                kfile = strndup(keyspec, c-keyspec);
-                kdev = strdup(c + 1);
-                if (!*kfile || !*kdev)
+                keyfile = strndup(keyspec, c-keyspec);
+                keydev = strdup(c + 1);
+                if (!keyfile || !keydev)
                         return log_oom();
         } else {
                 /* No keydev specified */
-                kfile = strdup(keyspec);
-                kdev = NULL;
-                if (!*kfile)
+                keyfile = strdup(keyspec);
+                keydev = NULL;
+                if (!keyfile)
                         return log_oom();
         }
 
-        *keyfile = TAKE_PTR(kfile);
-        *keydev = TAKE_PTR(kdev);
+        *ret_keyfile = TAKE_PTR(keyfile);
+        *ret_keydev = TAKE_PTR(keydev);
 
         return 0;
 }