diff --git a/src/template.c b/src/template.c
index cad211f..09818b7 100644
--- a/src/template.c
+++ b/src/template.c
@@ -208,11 +208,11 @@ main(void)
 	do {
 #endif
 		// * allocate heap for sample data
-		SAMPLE_TYPE* buffer = calloc(
+		SAMPLE_TYPE* buffer =
 #if SEQUENTIAL_MODE
-			calc_block_size,
+			malloc((size_t) calc_block_size *
 #else
-			PRODUCT,
+			calloc(PRODUCT,
 #endif
 			sizeof(SAMPLE_TYPE));