diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index a2dee7f66..28c931538 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -37,6 +37,14 @@
       public *;
 }
 
+# Hitomi extension crash fix
+-keepclassmembers class rx.Single {
+      *** onSubscribe;
+      final *;
+      protected *;
+      public *;
+}
+
 # RxJava 1.1.0
 -dontwarn sun.misc.**