diff --git a/autodispose/src/main/java/com/uber/autodispose/ExceptionHelper.java b/autodispose/src/main/java/com/uber/autodispose/ExceptionHelper.java
index 58d5f48b8..394998402 100644
--- a/autodispose/src/main/java/com/uber/autodispose/ExceptionHelper.java
+++ b/autodispose/src/main/java/com/uber/autodispose/ExceptionHelper.java
@@ -73,7 +73,7 @@ static final class Termination extends Throwable {
       super("No further exceptions");
     }
 
-    @Override public Throwable fillInStackTrace() {
+    @Override public synchronized Throwable fillInStackTrace() {
       return this;
     }
   }