diff --git a/google-oauth-client/src/main/resources/META-INF/proguard/google-oauth-client.pro b/google-oauth-client/src/main/resources/META-INF/proguard/google-oauth-client.pro
new file mode 100644
index 000000000..2a7e555de
--- /dev/null
+++ b/google-oauth-client/src/main/resources/META-INF/proguard/google-oauth-client.pro
@@ -0,0 +1 @@
+-keep,allowoptimization class com.google.api.client.auth.** { *; }