diff --git a/adb/adb.h b/adb/adb.h
index b9ed5560e..95610a738 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -33,7 +33,7 @@
 #define ADB_VERSION_MAJOR 1         // Used for help/version information
 #define ADB_VERSION_MINOR 0         // Used for help/version information
 
-#define ADB_SERVER_VERSION    20    // Increment this when we want to force users to start a new adb server
+#define ADB_SERVER_VERSION    21    // Increment this when we want to force users to start a new adb server
 
 typedef struct amessage amessage;
 typedef struct apacket apacket;