diff --git a/crates/re_data_store/src/log_db.rs b/crates/re_data_store/src/log_db.rs
index 7a29723bde12..2308af4cc59f 100644
--- a/crates/re_data_store/src/log_db.rs
+++ b/crates/re_data_store/src/log_db.rs
@@ -280,6 +280,7 @@ impl LogDb {
     }
 
     /// Free up some RAM by forgetting parts of the time that are more than `cutoff` ns in the past.
+    #[cfg(not(target_arch = "wasm32"))]
     pub fn clear_by_cutoff(&mut self, cutoff: i64) {
         let cutoff_time = Time::now().nanos_since_epoch() - cutoff;
         let oldest = self.entity_db.data_store.oldest_time_per_timeline();
diff --git a/crates/re_viewer/src/app.rs b/crates/re_viewer/src/app.rs
index 8f7b6fdf0521..9c3ec5f38b8b 100644
--- a/crates/re_viewer/src/app.rs
+++ b/crates/re_viewer/src/app.rs
@@ -849,6 +849,7 @@ impl App {
             }
         }
 
+        #[cfg(not(target_arch = "wasm32"))]
         for log_db in self.log_dbs.values_mut() {
             log_db.clear_by_cutoff(2e9 as i64);
         }