diff --git a/include/constants/item_config.h b/include/constants/item_config.h
index 4f111bc0ca..e78f748fa9 100644
--- a/include/constants/item_config.h
+++ b/include/constants/item_config.h
@@ -1,9 +1,6 @@
 #ifndef GUARD_CONSTANTS_ITEM_CONFIG_H
 #define GUARD_CONSTANTS_ITEM_CONFIG_H
 
-// Used by other branches to communicate with each other.
-#define ITEM_EXPANSION
-
 #ifndef GEN_3
 #define GEN_3 0
 #define GEN_4 1
diff --git a/include/global.h b/include/global.h
index 85166e0ecc..ab5162e6de 100644
--- a/include/global.h
+++ b/include/global.h
@@ -117,6 +117,10 @@
 #define DEX_FLAGS_NO (ROUND_BITS_TO_BYTES(NUM_SPECIES))
 #define NUM_FLAG_BYTES (ROUND_BITS_TO_BYTES(FLAGS_COUNT))
 
+// Branch defines:
+// Used by other branches to detect each other.
+#define ITEM_EXPANSION
+
 struct Coords8
 {
     s8 x;