diff --git a/doc/Changelog b/doc/Changelog
index 6a51e317e..2f289cae4 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -3,6 +3,7 @@
 	  null delete for wsaevent.
 	- Fix spelling in freebind option man page text.
 	- Fix windows link of ssl with crypt32.
+	- Fix 779:  Union casting is non-portable.
 
 13 June 2016: Ralph
 	- Use QTYPE=A for QNAME minimisation.
diff --git a/util/ub_event.c b/util/ub_event.c
index af2a18ea0..ebf9029e7 100644
--- a/util/ub_event.c
+++ b/util/ub_event.c
@@ -132,14 +132,10 @@ static void (*NATIVE_BITS_CB(void (*cb)(int, short, void*)))(int, short, void*)
 #define EVFLAG_AUTO 0
 #endif
 
-#define AS_EVENT_BASE(x) \
-	(((union {struct ub_event_base* a; struct event_base* b;})x).b)
-#define AS_UB_EVENT_BASE(x) \
-	(((union {struct event_base* a; struct ub_event_base* b;})x).b)
-#define AS_EVENT(x) \
-	(((union {struct ub_event* a; struct event* b;})x).b)
-#define AS_UB_EVENT(x) \
-	(((union {struct event* a; struct ub_event* b;})x).b)
+#define AS_EVENT_BASE(x) ((struct event_base*)x)
+#define AS_UB_EVENT_BASE(x) ((struct ub_event_base*)x)
+#define AS_EVENT(x) ((struct event*)x)
+#define AS_UB_EVENT(x) ((struct ub_event*)x)
 
 const char* ub_event_get_version()
 {
diff --git a/util/ub_event_pluggable.c b/util/ub_event_pluggable.c
index f8a4b9a6f..c30880a54 100644
--- a/util/ub_event_pluggable.c
+++ b/util/ub_event_pluggable.c
@@ -144,10 +144,8 @@ struct my_event {
 	struct event ev;
 };
 
-#define AS_MY_EVENT_BASE(x) \
-	(((union {struct ub_event_base* a; struct my_event_base* b;})x).b)
-#define AS_MY_EVENT(x) \
-	(((union {struct ub_event* a; struct my_event* b;})x).b)
+#define AS_MY_EVENT_BASE(x) ((struct my_event_base*)x)
+#define AS_MY_EVENT(x) ((struct my_event*)x)
 
 const char* ub_event_get_version()
 {