diff --git a/cmdline/snapraid.c b/cmdline/snapraid.c
index 041b2934..438c10d8 100644
--- a/cmdline/snapraid.c
+++ b/cmdline/snapraid.c
@@ -248,6 +248,7 @@ void config(char* conf, size_t conf_size, const char* argv0)
 #define OPT_NO_WARNINGS 286
 #define OPT_TEST_FAKE_UUID 287
 #define OPT_TEST_MATCH_FIRST_UUID 288
+#define OPT_TEST_FORCE_PARITY_UPDATE 289
 
 #if HAVE_GETOPT_LONG
 struct option long_options[] = {
@@ -372,6 +373,9 @@ struct option long_options[] = {
 	/* Match first UUID */
 	{ "test-match-first-uuid", 0, 0, OPT_TEST_MATCH_FIRST_UUID },
 
+	/* Force parity update even if all the data is not changed */
+	{ "test-force-parity-update", 0, 0, OPT_TEST_FORCE_PARITY_UPDATE },
+
 	{ 0, 0, 0, 0 }
 };
 #endif
@@ -747,6 +751,9 @@ int main(int argc, char* argv[])
 		case OPT_TEST_MATCH_FIRST_UUID :
 			opt.match_first_uuid = 1;
 			break;
+		case OPT_TEST_FORCE_PARITY_UPDATE :
+			opt.force_parity_update = 1;
+			break;
 		default :
 			/* LCOV_EXCL_START */
 			log_fatal("Unknown option '%c'\n", (char)c);
diff --git a/cmdline/state.h b/cmdline/state.h
index f00f89e5..fdbfb7ac 100644
--- a/cmdline/state.h
+++ b/cmdline/state.h
@@ -107,6 +107,7 @@ struct snapraid_option {
 	int expected_missing; /**< If missing files are expected and should not be reported. */
 	int fake_uuid; /**< Set fakes UUID for testing. */
 	int match_first_uuid; /**< Force the matching of the first UUID. */
+	int force_parity_update; /**< Force parity update even if data is not changed. */
 };
 
 /**
diff --git a/cmdline/sync.c b/cmdline/sync.c
index 4c925b26..e0a2aafe 100644
--- a/cmdline/sync.c
+++ b/cmdline/sync.c
@@ -554,7 +554,7 @@ static int state_sync_process(struct snapraid_state* state, struct snapraid_pari
 		/* have the hash cleared (::clear_past_hash flag), and then they won't never match the hash. */
 		/* We are treating only CHG blocks created at runtime. */
 		/* In such case, we can avoid to update parity, because it would be the same as before */
-		parity_needs_to_be_updated = 0;
+		parity_needs_to_be_updated = state->opt.force_parity_update;
 
 		/* if the block is marked as bad, we force the parity update */
 		/* because the bad block may be the result of a wrong parity */