diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
index 317ff2581..e57e816ea 100644
--- a/src/lxc/cgroups/cgfsng.c
+++ b/src/lxc/cgroups/cgfsng.c
@@ -215,7 +215,7 @@ static uint32_t *lxc_cpumask(char *buf, size_t nbits)
 	size_t arrlen;
 
 	arrlen = BITS_TO_LONGS(nbits);
-	bitarr = calloc(arrlen, sizeof(uint32_t));
+	bitarr = zalloc(arrlen * sizeof(uint32_t));
 	if (!bitarr)
 		return ret_set_errno(NULL, ENOMEM);