diff --git a/fantemp/statistics.cpp b/fantemp/statistics.cpp
index 4d7b655..14ede73 100644
--- a/fantemp/statistics.cpp
+++ b/fantemp/statistics.cpp
@@ -12,9 +12,18 @@ uint64_t Statistics::m_lastTempSave = 0;
 double Statistics::m_minTemp;
 double Statistics::m_maxTemp;
 
+namespace {
+
+// Must be in translation unit and cannot be forward declared
 EEVAR(double, e_minTemp);
 EEVAR(double, e_maxTemp);
 
+// Could be declared in every function that uses it, but that would be code duplication
+Eeprom<e_minTemp, true> g_eepMinTemp;
+Eeprom<e_maxTemp, true> g_eepMaxTemp;
+
+} // namespace
+
 void Statistics::init()
 {
 	m_minTemp = getMinTemp();
@@ -30,9 +39,6 @@ void Statistics::init()
 
 void Statistics::callback()
 {
-	Eeprom<e_minTemp, true> eepromMinTemp;
-	Eeprom<e_maxTemp, true> eepromMaxTemp;
-
 	if (Controller::m_dataAvailable) {
 		if (Controller::m_temperature < m_minTemp) {
 			m_minTemp = Controller::m_temperature;
@@ -42,8 +48,8 @@ void Statistics::callback()
 		}
 
 		if (clk::millis() >= m_lastTempSave + TEMP_SAVE_DELAY) {
-			eepromMinTemp = m_minTemp;
-			eepromMaxTemp = m_maxTemp;
+			g_eepMinTemp = m_minTemp;
+			g_eepMaxTemp = m_maxTemp;
 			m_lastTempSave = clk::millis();
 		}
 	}
@@ -51,12 +57,10 @@ void Statistics::callback()
 
 double Statistics::getMinTemp()
 {
-	Eeprom<e_minTemp, true> eepromMinTemp;
-	return eepromMinTemp;
+	return g_eepMinTemp;
 }
 
 double Statistics::getMaxTemp()
 {
-	Eeprom<e_maxTemp, true> eepromMaxTemp;
-	return eepromMaxTemp;
+	return g_eepMaxTemp;
 }