diff --git a/adb/set_verity_enable_state_service.cpp b/adb/set_verity_enable_state_service.cpp
index 7fa8291..85637f2 100644
--- a/adb/set_verity_enable_state_service.cpp
+++ b/adb/set_verity_enable_state_service.cpp
@@ -90,7 +90,7 @@
     uint32_t magic_number;
     const uint32_t new_magic = enable ? VERITY_METADATA_MAGIC_NUMBER
                                       : VERITY_METADATA_MAGIC_DISABLE;
-    uint64_t device_length;
+    uint64_t device_length = 0;
     int device = -1;
     int retval = -1;