diff --git a/src/game/puppylights.c b/src/game/puppylights.c
index 7b46726d..66072749 100644
--- a/src/game/puppylights.c
+++ b/src/game/puppylights.c
@@ -178,7 +178,7 @@ void puppylights_iterate(struct PuppyLight *light, Lights1 *src, struct Object *
 
 //Main function. Run this in the object you wish to illuminate, and just give it its light, object pointer and any potential flags if you want to use them.
 //If the object has multiple lights, then you run this for each light.
-void puppylights_run(Lights1 *src, struct Object *obj, s32 flags, s32 baseColour)
+void puppylights_run(Lights1 *src, struct Object *obj, s32 flags, u32 baseColour)
 {
     s32 i;
 
diff --git a/src/game/puppylights.h b/src/game/puppylights.h
index 47f06b5b..fbab4420 100644
--- a/src/game/puppylights.h
+++ b/src/game/puppylights.h
@@ -40,7 +40,7 @@ extern u16 gNumLights;
 extern u8 levelAmbient;
 extern struct PuppyLight *gPuppyLights[MAX_LIGHTS];
 extern struct MemoryPool *gLightsPool;
-extern void puppylights_run(Lights1 *src, struct Object *obj, s32 flags, s32 baseColour);
+extern void puppylights_run(Lights1 *src, struct Object *obj, s32 flags, u32 baseColour);
 extern void puppylights_object_emit(struct Object *obj);
 extern void cur_obj_enable_light(void);
 extern void cur_obj_disable_light(void);