diff --git a/src/net/cgo_unix.go b/src/net/cgo_unix.go
index 0a783d08a9..19bcd22231 100644
--- a/src/net/cgo_unix.go
+++ b/src/net/cgo_unix.go
@@ -320,6 +320,7 @@ func cgoResSearch(hostname string, rtype, class int) ([]dnsmessage.Resource, err
 	defer releaseThread()
 
 	state := (*_C_struct___res_state)(_C_malloc(unsafe.Sizeof(_C_struct___res_state{})))
+        _C_memset(unsafe.Pointer(state), 0, uintptr(unsafe.Sizeof(*state)))
 	defer _C_free(unsafe.Pointer(state))
 	if err := _C_res_ninit(state); err != nil {
 		return nil, errors.New("res_ninit failure: " + err.Error())
diff --git a/src/net/cgo_unix_cgo.go b/src/net/cgo_unix_cgo.go
index 7c609eddbf..3ea1b5ae87 100644
--- a/src/net/cgo_unix_cgo.go
+++ b/src/net/cgo_unix_cgo.go
@@ -58,6 +58,7 @@ type (
 
 func _C_malloc(n uintptr) unsafe.Pointer { return C.malloc(C.size_t(n)) }
 func _C_free(p unsafe.Pointer)           { C.free(p) }
+func _C_memset(p unsafe.Pointer, c _C_int, n uintptr) { C.memset(p, c, C.size_t(n)) }
 
 func _C_ai_addr(ai *_C_struct_addrinfo) **_C_struct_sockaddr { return &ai.ai_addr }
 func _C_ai_family(ai *_C_struct_addrinfo) *_C_int            { return &ai.ai_family }