diff --git a/android/proguard-rules.pro b/android/proguard-rules.pro
index eaaaeb646..0ff03e0ff 100644
--- a/android/proguard-rules.pro
+++ b/android/proguard-rules.pro
@@ -2,6 +2,10 @@
 -keepnames class com.shatteredpixel.** { *; }
 -keepnames class com.watabou.** { *; }
 
+# For some reason optimizing shader classes causes visual errors on AGP 4.0
+# TODO check this every so often, might be a bug that gets resolved
+-keep class com.watabou.noosa.NoosaScript* { *; }
+
 # retained to support meaningful stack traces
 # note that the mapping file must be referenced in order to make sense of line numbers
 # mapping file can be found in core/build/outputs/mapping after running a release build