diff --git a/cofi-share/proguard-rules.pro b/cofi-share/proguard-rules.pro
index 481bb434..8dcc9ec0 100644
--- a/cofi-share/proguard-rules.pro
+++ b/cofi-share/proguard-rules.pro
@@ -18,4 +18,6 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+#-renamesourcefileattribute SourceFile
+
+-dontwarn java.lang.invoke.StringConcatFactory