diff --git a/src/win/udp.c b/src/win/udp.c
index 72be23c6d..21348f379 100644
--- a/src/win/udp.c
+++ b/src/win/udp.c
@@ -897,13 +897,12 @@ int uv__udp_send(uv_udp_send_t* req,
   int err;
 
   if (!(handle->flags & UV_HANDLE_BOUND)) {
-    if (addrlen == sizeof(uv_addr_ip4_any_)) {
+    if (addrlen == sizeof(uv_addr_ip4_any_))
       bind_addr = (const struct sockaddr*) &uv_addr_ip4_any_;
-    } else if (addrlen == sizeof(uv_addr_ip6_any_)) {
+    else if (addrlen == sizeof(uv_addr_ip6_any_))
       bind_addr = (const struct sockaddr*) &uv_addr_ip6_any_;
-    } else {
-      abort();
-    }
+    else
+      return UV_EINVAL;
     err = uv_udp_maybe_bind(handle, bind_addr, addrlen, 0);
     if (err)
       return uv_translate_sys_error(err);
@@ -938,7 +937,7 @@ int uv__udp_try_send(uv_udp_t* handle,
     else if (addrlen == sizeof(uv_addr_ip6_any_))
       bind_addr = (const struct sockaddr*) &uv_addr_ip6_any_;
     else
-      abort();
+      return UV_EINVAL;
     err = uv_udp_maybe_bind(handle, bind_addr, addrlen, 0);
     if (err)
       return uv_translate_sys_error(err);