diff --git a/ambientd.c3 b/ambientd.c3
index 6aff2e6..ec2ff57 100644
--- a/ambientd.c3
+++ b/ambientd.c3
@@ -149,6 +149,7 @@ fn int main()
 		if (catch excuse = _x) {
 		  io::eprintfn("Error reading luminance: %s", excuse);
 		} else {
+			luminance_samples[idx] = _x;
 		  idx = (idx + 1) % MEDIAN_SAMPLES;
 		}