diff --git a/lib/iser.c b/lib/iser.c
index bbd9662..b8e49c6 100644
--- a/lib/iser.c
+++ b/lib/iser.c
@@ -46,7 +46,7 @@
   *
  */
 #define container_of(ptr, type, member) \
-    ((type *) ((uint8_t *)(ptr) - offsetof(type, member)))
+        ((type *)(void *)((uint8_t *)(ptr) - offsetof(type, member)))
 #endif