diff --git a/isisd/isis_flex_algo.c b/isisd/isis_flex_algo.c
index db6fc348eb..ef30987b8e 100644
--- a/isisd/isis_flex_algo.c
+++ b/isisd/isis_flex_algo.c
@@ -45,7 +45,7 @@ void *isis_flex_algo_data_alloc(void *voidarg)
 	struct isis_flex_algo_alloc_arg *arg = voidarg;
 	struct isis_flex_algo_data *data;
 
-	data = XCALLOC(MTYPE_FLEX_ALGO, sizeof(*data));
+	data = XCALLOC(MTYPE_FLEX_ALGO, sizeof(struct isis_flex_algo_data));
 
 	for (int tree = SPFTREE_IPV4; tree < SPFTREE_COUNT; tree++) {
 		for (int level = ISIS_LEVEL1; level <= ISIS_LEVEL2; level++) {
diff --git a/lib/flex_algo.c b/lib/flex_algo.c
index 72cefc551d..b4ae86369f 100644
--- a/lib/flex_algo.c
+++ b/lib/flex_algo.c
@@ -28,7 +28,8 @@ struct flex_algos *flex_algos_alloc(flex_algo_allocator_t allocator,
 {
 	struct flex_algos *flex_algos;
 
-	flex_algos = XCALLOC(MTYPE_FLEX_ALGO_DATABASE, sizeof(*flex_algos));
+	flex_algos =
+		XCALLOC(MTYPE_FLEX_ALGO_DATABASE, sizeof(struct flex_algos));
 	flex_algos->flex_algos = list_new();
 	flex_algos->allocator = allocator;
 	flex_algos->releaser = releaser;
@@ -51,7 +52,7 @@ struct flex_algo *flex_algo_alloc(struct flex_algos *flex_algos,
 {
 	struct flex_algo *fa;
 
-	fa = XCALLOC(MTYPE_FLEX_ALGO, sizeof(*fa));
+	fa = XCALLOC(MTYPE_FLEX_ALGO, sizeof(struct flex_algo));
 	fa->algorithm = algorithm;
 	if (flex_algos->allocator)
 		fa->data = flex_algos->allocator(arg);