diff --git a/include/input/KeyCharacterMap.h b/include/input/KeyCharacterMap.h
index eb5840e..7935927 100644
--- a/include/input/KeyCharacterMap.h
+++ b/include/input/KeyCharacterMap.h
@@ -31,6 +31,9 @@
 #include <utils/Unicode.h>
 #include <utils/RefBase.h>
 
+// Maximum number of keys supported by KeyCharacterMaps
+#define MAX_KEYS 8192
+
 namespace android {
 
 /**