diff --git a/crates/ty_server/src/server/api/diagnostics.rs b/crates/ty_server/src/server/api/diagnostics.rs
index d50edaeaf1..4728431732 100644
--- a/crates/ty_server/src/server/api/diagnostics.rs
+++ b/crates/ty_server/src/server/api/diagnostics.rs
@@ -42,7 +42,7 @@ impl Diagnostics<'_> {
         // Hash the length first to ensure different numbers of diagnostics produce different hashes
         diagnostics.hash(&mut hasher);
 
-        Some(format!("{:x}", hasher.finish()))
+        Some(format!("{:016x}", hasher.finish()))
     }
 
     /// Computes the result ID for the diagnostics.