diff --git a/ambientd.c3 b/ambientd.c3
index df3c564..ea9346d 100644
--- a/ambientd.c3
+++ b/ambientd.c3
@@ -127,7 +127,7 @@ fn int main()
 	int brightness_old = min_brightness;
 	int brightness_adjusted = min_brightness;
 	int brightness_delta;
-	int luminance_median;
+	float luminance_median;
 	float luminance_percent;
 	while (1) {
 		int! tmp = get_luminance_raw();