diff --git a/src/libltfs/tape.c b/src/libltfs/tape.c
index 255ca2a2..ed6314a5 100644
--- a/src/libltfs/tape.c
+++ b/src/libltfs/tape.c
@@ -1767,7 +1767,7 @@ int tape_set_cart_coherency(struct device_data *dev, const tape_partition_t part
 	struct tc_coherency *coh)
 {
 	int ret;
-	unsigned char coh_data[TC_MAM_PAGE_COHERENCY_SIZE + TC_MAM_PAGE_HEADER_SIZE];
+	unsigned char coh_data[TC_MAM_PAGE_COHERENCY_SIZE + TC_MAM_PAGE_HEADER_SIZE] = {0};
 
 	CHECK_ARG_NULL(dev, -LTFS_NULL_ARG);
 	CHECK_ARG_NULL(dev->backend, -LTFS_NULL_ARG);