diff --git a/ambientd.c3 b/ambientd.c3
index a8fabad..30253d5 100644
--- a/ambientd.c3
+++ b/ambientd.c3
@@ -201,6 +201,6 @@ fn int main()
 		}
 
 		// TODO: option to turn off logging
-		io::printfn("brightness {target=%d, adjusted=%d}, offset=%d, luminance=%d (%.5f%%)", brightness_target, brightness_adjusted, user_offset, luminance_median, luminance_percent*100);
+		io::printfn("brightness {target=%d, adjusted=%d}, offset=%d, luminance=%d (%.1f%%)", brightness_target, brightness_adjusted, user_offset, luminance_median, luminance_percent*100);
 	}
 }