diff --git a/tommyds/tommyarrayblk.c b/tommyds/tommyarrayblk.c
index 623fe920..d4dda763 100644
--- a/tommyds/tommyarrayblk.c
+++ b/tommyds/tommyarrayblk.c
@@ -65,7 +65,7 @@ void tommy_arrayblk_grow(tommy_arrayblk* array, tommy_count_t count)
 
 		/* allocate new blocks */
 		while (block_mac < block_max) {
-			void** ptr = tommy_calloc(TOMMY_ARRAYBLK_SIZE, sizeof(void*));
+			void** ptr = tommy_cast(void**, tommy_calloc(TOMMY_ARRAYBLK_SIZE, sizeof(void*)));
 
 			/* set the new block */
 			tommy_array_set(&array->block, block_mac, ptr);
diff --git a/tommyds/tommyarrayblkof.c b/tommyds/tommyarrayblkof.c
index 59d87c73..7d3275d6 100644
--- a/tommyds/tommyarrayblkof.c
+++ b/tommyds/tommyarrayblkof.c
@@ -66,7 +66,7 @@ void tommy_arrayblkof_grow(tommy_arrayblkof* array, tommy_count_t count)
 
 		/* allocate new blocks */
 		while (block_mac < block_max) {
-			void** ptr = tommy_calloc(TOMMY_ARRAYBLK_SIZE, array->element_size);
+			void** ptr = tommy_cast(void**, tommy_calloc(TOMMY_ARRAYBLK_SIZE, array->element_size));
 
 			/* set the new block */
 			tommy_array_set(&array->block, block_mac, ptr);