diff --git a/src/Input.cpp b/src/Input.cpp
index 219b2e99..58f8e6af 100644
--- a/src/Input.cpp
+++ b/src/Input.cpp
@@ -8,10 +8,10 @@
 
 #include "WindowsWrapper.h"
 
-static SDL_Joystick *joystick;
-
-static int joystick_neutral_x;
-static int joystick_neutral_y;
+// The original names for these variables are unknown
+static SDL_Joystick *joystick = NULL;
+static int joystick_neutral_x = 0;
+static int joystick_neutral_y = 0;
 
 void ReleaseDirectInput(void)
 {
@@ -25,8 +25,6 @@ void ReleaseDirectInput(void)
 	SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
 }
 
-BOOL HookAllDirectInputDevices(void);
-
 BOOL InitDirectInput(void)
 {
 	SDL_InitSubSystem(SDL_INIT_JOYSTICK);
@@ -37,7 +35,7 @@ BOOL InitDirectInput(void)
 	return TRUE;
 }
 
-// The original name for this function is unknown
+// The original name for this function and its variables are unknown
 BOOL HookAllDirectInputDevices(void)
 {
 	int i;