diff --git a/backend/telemetry_core/src/aggregator/inner_loop.rs b/backend/telemetry_core/src/aggregator/inner_loop.rs
index bdb3c94..6598bfa 100644
--- a/backend/telemetry_core/src/aggregator/inner_loop.rs
+++ b/backend/telemetry_core/src/aggregator/inner_loop.rs
@@ -277,7 +277,7 @@ impl InnerLoop {
             .map(|c| c.len())
             .sum();
 
-        let num_messages_to_feeds = self.feed_channels
+        let num_messages_to_feeds: usize = self.feed_channels
             .values()
             .map(|c| c.len())
             .sum();