1 files changed, 1 insertions, 1 deletions
diff --git a/src/libsyntax_pos/edition.rs b/src/libsyntax_pos/edition.rs
index 7709db72a02..fce8fc3db4e 100644
--- a/src/libsyntax_pos/edition.rs
+++ b/src/libsyntax_pos/edition.rs
@@ -65,7 +65,7 @@ impl Edition {
     pub fn is_stable(&self) -> bool {
         match *self {
             Edition::Edition2015 => true,
-            Edition::Edition2018 => true,
+            Edition::Edition2018 => false,
         }
     }
 }