diff --git a/firmware/common/utility.cpp b/firmware/common/utility.cpp
index 14a9067e..b29a9b74 100644
--- a/firmware/common/utility.cpp
+++ b/firmware/common/utility.cpp
@@ -22,7 +22,6 @@
 #include "utility.hpp"
 
 #include <cstdint>
-#include <cmath>
 
 #if 0
 uint32_t gcd(const uint32_t u, const uint32_t v) {
@@ -84,10 +83,9 @@ float fast_pow2(const float val) {
 }
 
 float mag2_to_dbv_norm(const float mag2) {
-	constexpr float mag2_max = 1.0f;
-	constexpr float mag2_log2_max = std::log2(mag2_max);
+	constexpr float mag2_log2_max = 0.0f; //std::log2(1.0f);
 	constexpr float log_mag2_mag_factor = 0.5f;
-	constexpr float log2_log10_factor = std::log10(2.0f);
+	constexpr float log2_log10_factor = 0.3010299956639812f; //std::log10(2.0f);
 	constexpr float log10_dbv_factor = 20.0f;
 	constexpr float mag2_to_db_factor = log_mag2_mag_factor * log2_log10_factor * log10_dbv_factor;
 	return (fast_log2(mag2) - mag2_log2_max) * mag2_to_db_factor;