diff --git a/.gitignore b/.gitignore
index a5c2d2d..2467a3c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .vs/
 out/
-*.json
\ No newline at end of file
+build/
+*.json
diff --git a/NES Emulator/controller.c b/NES Emulator/controller.c
index 57e05b2..3a7e742 100644
--- a/NES Emulator/controller.c	
+++ b/NES Emulator/controller.c	
@@ -15,7 +15,7 @@ Byte pollInput(struct Controller* controller)
 
 void fillRegister(struct Controller* controller)
 {
-	Byte* keyboard = SDL_GetKeyboardState(NULL);
+	const Byte* keyboard = SDL_GetKeyboardState(NULL);
 
 	controller->data.A = keyboard[SDL_SCANCODE_A];
 	controller->data.B = keyboard[SDL_SCANCODE_S];