1 files changed, 1 insertions, 1 deletions
diff --git a/src/librustc_errors/diagnostic_builder.rs b/src/librustc_errors/diagnostic_builder.rs
index 60a68b1e496..f4289ea2d4b 100644
--- a/src/librustc_errors/diagnostic_builder.rs
+++ b/src/librustc_errors/diagnostic_builder.rs
@@ -128,7 +128,7 @@ impl<'a> DiagnosticBuilder<'a> {
         message: &str,
         span: Option<S>,
     ) -> &mut Self {
-        let span = span.map(|s| s.into()).unwrap_or(MultiSpan::new());
+        let span = span.map(|s| s.into()).unwrap_or_else(|| MultiSpan::new());
         self.diagnostic.sub(level, message, span, None);
         self
     }