diff --git a/include/uv.h b/include/uv.h
index 58e424b1..71749e44 100644
--- a/include/uv.h
+++ b/include/uv.h
@@ -190,14 +190,14 @@ typedef struct uv_work_s uv_work_t;
  * All callbacks in libuv are made asynchronously. That is they are never
  * made by the function that takes them as a parameter.
  */
-UV_EXTERN uv_loop_t* uv_loop_new();
+UV_EXTERN uv_loop_t* uv_loop_new(void);
 UV_EXTERN void uv_loop_delete(uv_loop_t*);
 
 
 /*
  * Returns the default loop.
  */
-UV_EXTERN uv_loop_t* uv_default_loop();
+UV_EXTERN uv_loop_t* uv_default_loop(void);
 
 /*
  * This function starts the event loop. It blocks until the reference count
diff --git a/src/unix/core.c b/src/unix/core.c
index a63a6a47..19d5b915 100644
--- a/src/unix/core.c
+++ b/src/unix/core.c
@@ -158,7 +158,7 @@ void uv_close(uv_handle_t* handle, uv_close_cb close_cb) {
 }
 
 
-uv_loop_t* uv_loop_new() {
+uv_loop_t* uv_loop_new(void) {
   uv_loop_t* loop = calloc(1, sizeof(uv_loop_t));
   loop->ev = ev_loop_new(0);
   ev_set_userdata(loop->ev, loop);
@@ -173,7 +173,7 @@ void uv_loop_delete(uv_loop_t* loop) {
 }
 
 
-uv_loop_t* uv_default_loop() {
+uv_loop_t* uv_default_loop(void) {
   if (!default_loop_ptr) {
     default_loop_ptr = &default_loop_struct;
 #if HAVE_KQUEUE
diff --git a/src/win/core.c b/src/win/core.c
index 3267b0cf..67eb461d 100644
--- a/src/win/core.c
+++ b/src/win/core.c
@@ -99,7 +99,7 @@ static void uv_default_loop_init(void) {
 }
 
 
-uv_loop_t* uv_default_loop() {
+uv_loop_t* uv_default_loop(void) {
   uv_once(&uv_default_loop_init_guard_, uv_default_loop_init);
   return &uv_default_loop_;
 }