diff --git a/parity.c b/parity.c
index 4e40f3ce..dea5197a 100644
--- a/parity.c
+++ b/parity.c
@@ -74,7 +74,7 @@ void parity_overflow(struct snapraid_state* state, data_off_t size)
 			struct snapraid_file* file = j->data;
 
 			if (file->blockmax > 0) {
-				if (file->blockvec[0].parity_pos >= blockalloc) {
+				if (file->blockvec[file->blockmax - 1].parity_pos >= blockalloc) {
 					fprintf(stdlog, "outofparity:%s:%s\n", disk->name, file->sub);
 					fflush(stdlog);
 					if (first) {