diff --git a/crc/crc16_t10dif_perf.c b/crc/crc16_t10dif_perf.c
index 5576e6d..34f1ddb 100644
--- a/crc/crc16_t10dif_perf.c
+++ b/crc/crc16_t10dif_perf.c
@@ -72,6 +72,7 @@ int main(int argc, char *argv[])
 	printf("Start timed tests\n");
 	fflush(0);
 
+	memset(buf, 0, TEST_LEN);
 	crc = crc16_t10dif(TEST_SEED, buf, TEST_LEN);
 	perf_start(&start);
 	for (i = 0; i < TEST_LOOPS; i++) {
diff --git a/crc/crc32_ieee_perf.c b/crc/crc32_ieee_perf.c
index 0a7559c..c6c7495 100644
--- a/crc/crc32_ieee_perf.c
+++ b/crc/crc32_ieee_perf.c
@@ -72,6 +72,7 @@ int main(int argc, char *argv[])
 	printf("Start timed tests\n");
 	fflush(0);
 
+	memset(buf, 0, TEST_LEN);
 	crc = crc32_ieee(TEST_SEED, buf, TEST_LEN);
 	perf_start(&start);
 	for (i = 0; i < TEST_LOOPS; i++) {
diff --git a/crc/crc32_iscsi_perf.c b/crc/crc32_iscsi_perf.c
index ddcb2b2..2770099 100644
--- a/crc/crc32_iscsi_perf.c
+++ b/crc/crc32_iscsi_perf.c
@@ -72,6 +72,7 @@ int main(int argc, char *argv[])
 	printf("Start timed tests\n");
 	fflush(0);
 
+	memset(buf, 0, TEST_LEN);
 	crc = crc32_iscsi(buf, TEST_LEN, TEST_SEED);
 	perf_start(&start);
 	for (i = 0; i < TEST_LOOPS; i++) {