diff --git a/src/template.c b/src/template.c
index 9077a74..c368ba7 100644
--- a/src/template.c
+++ b/src/template.c
@@ -195,7 +195,13 @@ main(void)
 		       (uintmax_t) (sizeof(SAMPLE_TYPE) / sizeof(uint8_t)));
 		exit(EXIT_FAILURE);
 	}
-	const size_t MAX = (PRODUCT + (BLOCK_SIZE - 1)) / BLOCK_SIZE;
+	const size_t MAX =
+#if BLOCK_SIZE > 0
+		(PRODUCT + (BLOCK_SIZE - 1)) / BLOCK_SIZE
+#else
+		0
+#endif
+		;
 
 	size_t w = 0;
 	for (size_t seq = 0; seq < MAX; seq++) {