diff --git a/src/mock.cpp b/src/mock.cpp
index a66818c..946507f 100644
--- a/src/mock.cpp
+++ b/src/mock.cpp
@@ -65,11 +65,11 @@ namespace sta
     float MS56xx::getPressure(Unit unit /* = Unit::hPa */)
     {    
         requestData(TEMPERATURE);
-        float temperature;
+        float temperature = 0.0f;
         spatz::request(STA_MS56XX_TEMPERATURE_SPATZ_ID, &temperature, 1);
         
         requestData(PRESSURE);
-        float pressure;
+        float pressure = 0.0f;
         spatz::request(STA_MS56XX_PRESSURE_SPATZ_ID, &pressure, 1);
         
         // Convert to desired unit.
@@ -81,7 +81,7 @@ namespace sta
     float MS56xx::getTemperature()
     {
         requestData(TEMPERATURE);
-		float temperature;
+		float temperature = 0.0f;
         spatz::request(STA_MS56XX_TEMPERATURE_SPATZ_ID, &temperature, 1);
 
     	return temperature;