diff --git a/src/fm95.c b/src/fm95.c
index d7bd773..a82bb78 100644
--- a/src/fm95.c
+++ b/src/fm95.c
@@ -542,7 +542,8 @@ int main(int argc, char **argv) {
 			if(sca_on) mpx += modulate_fm(&sca_mod, hard_clip(current_sca_in, sca_clipper_threshold))*SCA_VOLUME;
 
 			float mpx_only = measure_mpx(&mpx_only_power, mpx * mpx_deviation);
-			float mpower = measure_mpx(&power, (audio+mpx) * mpx_deviation) - mpx_only;
+			float mpower = measure_mpx(&power, (audio+mpx) * mpx_deviation);
+			mpower = deviation_to_dbr(dbr_to_deviation(mpower) - dbr_to_deviation(mpx_only));
 			if (mpower > mpx_power) {
 				float excess_power = mpower - mpx_power;
 				audio *= (dbr_to_deviation(-excess_power)/mpx_deviation);