diff --git a/filter/bs412.c b/filter/bs412.c
index d710adc..20eb240 100644
--- a/filter/bs412.c
+++ b/filter/bs412.c
@@ -8,11 +8,11 @@ inline float dbr_to_deviation(float dbr) {
 	return 19000.0f * sqrtf(pow(10.0, dbr / 10.0));
 }
 
-// #define SQRT19000 180499999.99999997f // (19000 / sqrt(2)) * 19000 / sqrt(2)
-// inline float deviation_to_dbr(float deviation) {
-// 	if (deviation < 1e-6f) return -100.0f;
-// 	return 10*log10f((deviation*deviation)/SQRT19000);
-// }
+#define SQRT19000 180499999.99999997f // (19000 / sqrt(2)) * 19000 / sqrt(2)
+inline float deviation_to_dbr(float deviation) {
+	if (deviation < 1e-6f) return -100.0f;
+	return 10*log10f((deviation*deviation)/SQRT19000);
+}
 
 void init_bs412(BS412Compressor* comp, uint32_t mpx_deviation, float target_power, float attack, float release, float max_gain, uint32_t sample_rate) {
 	comp->mpx_deviation = mpx_deviation;