diff --git a/include/event_object_movement.h b/include/event_object_movement.h
index 6abb4416fa..cd76cac11c 100644
--- a/include/event_object_movement.h
+++ b/include/event_object_movement.h
@@ -20,9 +20,9 @@ enum ReflectionTypes
 {
     REFL_TYPE_NONE,
     REFL_TYPE_ICE,
-    REFL_TYPE_WATER
+    REFL_TYPE_WATER,
+    NUM_REFLECTION_TYPES
 };
-#define NUM_REFLECTION_TYPES 2
 
 #define FIGURE_8_LENGTH 72
 
diff --git a/src/event_object_movement.c b/src/event_object_movement.c
index afbeaa5935..9106812416 100644
--- a/src/event_object_movement.c
+++ b/src/event_object_movement.c
@@ -7514,7 +7514,7 @@ static void ObjectEventUpdateMetatileBehaviors(struct ObjectEvent *objEvent)
 
 static void GetGroundEffectFlags_Reflection(struct ObjectEvent *objEvent, u32 *flags)
 {
-    u32 reflectionFlags[NUM_REFLECTION_TYPES] = { 
+    u32 reflectionFlags[NUM_REFLECTION_TYPES - 1] = { 
         [REFL_TYPE_ICE   - 1] = GROUND_EFFECT_FLAG_ICE_REFLECTION,
         [REFL_TYPE_WATER - 1] = GROUND_EFFECT_FLAG_WATER_REFLECTION
     };