diff --git a/nullaway/src/main/java/com/uber/nullaway/NullabilityUtil.java b/nullaway/src/main/java/com/uber/nullaway/NullabilityUtil.java
index b1997385e6..f8d7386621 100644
--- a/nullaway/src/main/java/com/uber/nullaway/NullabilityUtil.java
+++ b/nullaway/src/main/java/com/uber/nullaway/NullabilityUtil.java
@@ -362,7 +362,7 @@ private static boolean targetTypeMatches(Symbol sym, TypeAnnotationPosition posi
         // on other types in the signature (e.g. `class Foo extends Bar<@A Baz> {}`).
         return false;
       default:
-        throw new AssertionError("unsupported element kind: " + sym.getKind());
+        throw new AssertionError("unsupported element kind " + sym.getKind() + " symbol " + sym);
     }
   }