diff --git a/adb_utils.h b/adb_utils.h
index 4b64afa..84f7d0c 100644
--- a/adb_utils.h
+++ b/adb_utils.h
@@ -24,4 +24,6 @@
 
 std::string escape_arg(const std::string& s);
 
+void dump_hex(const void* ptr, size_t byte_count);
+
 #endif