diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index 82b75dc59..be7587138 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -100,6 +100,10 @@ FILE *kf_list;
 FILE *keyfile;
 #endif
 
+#if CONFIG_INTERNAL_STATS
+typedef enum { Y, U, V, ALL } STAT_TYPE;
+#endif  // CONFIG_INTERNAL_STATS
+
 static INLINE void Scale2Ratio(AOM_SCALING mode, int *hr, int *hs) {
   switch (mode) {
     case NORMAL:
diff --git a/av1/encoder/encoder.h b/av1/encoder/encoder.h
index 8d67c6737..20eefe36d 100644
--- a/av1/encoder/encoder.h
+++ b/av1/encoder/encoder.h
@@ -307,13 +307,15 @@ typedef struct ActiveMap {
   unsigned char *map;
 } ActiveMap;
 
-typedef enum { Y, U, V, ALL } STAT_TYPE;
+#define NUM_STAT_TYPES 4  // types of stats: Y, U, V and ALL
 
 typedef struct IMAGE_STAT {
-  double stat[ALL + 1];
+  double stat[NUM_STAT_TYPES];
   double worst;
 } ImageStat;
 
+#undef NUM_STAT_TYPES
+
 typedef struct {
   int ref_count;
   YV12_BUFFER_CONFIG buf;