diff --git a/src/librustc_data_structures/obligation_forest/mod.rs b/src/librustc_data_structures/obligation_forest/mod.rs
index fb2d3291a601..5e590cb445f7 100644
--- a/src/librustc_data_structures/obligation_forest/mod.rs
+++ b/src/librustc_data_structures/obligation_forest/mod.rs
@@ -333,6 +333,7 @@ impl<O: ForestObligation> ObligationForest<O> {
                     }
                 }
                 Err(err) => {
+                    stalled = false;
                     let backtrace = self.error_at(index);
                     errors.push(Error {
                         error: err,