diff --git a/src/cryptsetup/cryptsetup.c b/src/cryptsetup/cryptsetup.c
index e8ba3f02a3..56a3b50974 100644
--- a/src/cryptsetup/cryptsetup.c
+++ b/src/cryptsetup/cryptsetup.c
@@ -468,7 +468,8 @@ int main(int argc, char *argv[]) {
                                                  opt_keyfile_size,
                                                  &params);
 
-                                pass_volume_key = !!hash;
+                                /* hash == NULL implies the user passed "plain" */
+                                pass_volume_key = (hash == NULL);
                         }
 
                         if (k < 0) {