diff --git a/src/light.c b/src/light.c
index 1ac7d64..3a36a68 100644
--- a/src/light.c
+++ b/src/light.c
@@ -4,10 +4,10 @@ static GLuint _pId = 0;
 static GLuint _quadId = 0;
 
 // Initialize
-static void init();
+static void init(void);
 
 // Draw
-static void draw();
+static void draw(void);
 
 void lights(int state) {
   switch (state) {
@@ -24,7 +24,7 @@ void lights(int state) {
   }
 }
 
-static void init() {
+static void init(void) {
   _quadId = gl4dgGenQuadf();
   _pId = gl4duCreateProgram("<vs>shaders/lights.vs", "<fs>shaders/lights.fs",
                             NULL);
@@ -36,7 +36,7 @@ static void init() {
   glEnable(GL_DEPTH_TEST);
 }
 
-static void draw() {
+static void draw(void) {
   glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);