diff --git a/src/template.c b/src/template.c
index 4996236..121ef08 100644
--- a/src/template.c
+++ b/src/template.c
@@ -204,7 +204,8 @@ main(void)
 	if (BLOCK_SIZE < 1) {
 		printf("The block size %" PRIuMAX " is too small, should be at least "
 		       "%" PRIuMAX " bytes\n", (uintmax_t) BLOCK_SIZE_BYTES,
-		       (uintmax_t) (sizeof(SAMPLE_TYPE) / sizeof(uint8_t)));
+		       (uintmax_t) ((sizeof(SAMPLE_TYPE) + sizeof(uint8_t) - 1) /
+		                     sizeof(uint8_t)));
 		return EXIT_FAILURE;
 	}