diff --git a/src/tools/rust-analyzer/crates/rust-analyzer/src/diagnostics.rs b/src/tools/rust-analyzer/crates/rust-analyzer/src/diagnostics.rs
index cd7c632d105e..2711bdba693b 100644
--- a/src/tools/rust-analyzer/crates/rust-analyzer/src/diagnostics.rs
+++ b/src/tools/rust-analyzer/crates/rust-analyzer/src/diagnostics.rs
@@ -134,6 +134,7 @@ impl DiagnosticCollection {
         if self.check[flycheck_id].generation > generation {
             return;
         }
+        self.check[flycheck_id].generation = generation;
         let diagnostics = self.check[flycheck_id]
             .per_package
             .entry(package_id.clone())