diff --git a/tools/aapt2/util/Util.cpp b/tools/aapt2/util/Util.cpp
index 44b4ec1..efbbf8e 100644
--- a/tools/aapt2/util/Util.cpp
+++ b/tools/aapt2/util/Util.cpp
@@ -22,9 +22,9 @@
 #include <vector>
 
 #include "android-base/stringprintf.h"
+#include "android-base/strings.h"
 #include "androidfw/StringPiece.h"
 #include "build/version.h"
-
 #include "text/Unicode.h"
 #include "text/Utf8Iterator.h"
 #include "util/BigBuffer.h"
@@ -231,7 +231,14 @@
   static const char* const sMinorVersion = "19";
 
   // The build id of aapt2 binary.
-  static const std::string sBuildId = android::build::GetBuildNumber();
+  static std::string sBuildId = android::build::GetBuildNumber();
+
+  if (android::base::StartsWith(sBuildId, "eng.")) {
+    time_t now = time(0);
+    tm* ltm = localtime(&now);
+
+    sBuildId = android::base::StringPrintf("eng.%d%d", 1900 + ltm->tm_year, 1 + ltm->tm_mon);
+  }
 
   return android::base::StringPrintf("%s.%s-%s", sMajorVersion, sMinorVersion, sBuildId.c_str());
 }