diff --git a/firmware/src/dancepad.h b/firmware/src/dancepad.h
index 4391f4e..67ed8d1 100644
--- a/firmware/src/dancepad.h
+++ b/firmware/src/dancepad.h
@@ -28,12 +28,12 @@
 /**
  * Initialize the driver.
  */
-void DANCEPAD_Initialize();
+void DANCEPAD_Initialize(void);
 
 /**
  * Perform any driver-related tasks. Must be called once every loop.
  */
-void DANCEPAD_Tasks();
+void DANCEPAD_Tasks(void);
 
 #endif	/* DANCEPAD_H */
 
diff --git a/firmware/src/padhal.h b/firmware/src/padhal.h
index 1313a19..34eca49 100644
--- a/firmware/src/padhal.h
+++ b/firmware/src/padhal.h
@@ -28,13 +28,13 @@
 /**
  * Initialize IO for reading the pad sensors.
  */
-void PADHAL_Initialize();
+void PADHAL_Initialize(void);
 
 /**
  * Get the current state of all pad sensors.
  * @return the pad states, as the first 6 bits in a uint8_t.
  */
-uint8_t PADHAL_GetButtons();
+uint8_t PADHAL_GetButtons(void);
 
 #endif	/* PADHAL_H */