diff --git a/mission/controller/PowerController.cpp b/mission/controller/PowerController.cpp
index e2862b80..f8a02c09 100644
--- a/mission/controller/PowerController.cpp
+++ b/mission/controller/PowerController.cpp
@@ -287,7 +287,7 @@ ReturnValue_t PowerController::calculateOpenCircuitVoltageCharge() {
 
 ReturnValue_t PowerController::calculateCoulombCounterCharge() {
   double timeDiff = 0.0;
-  if (timevalOperations::toDouble(oldTime) != 0) {
+  if (oldTime.tv_sec != 0) {
     timeDiff = timevalOperations::toDouble(now - oldTime);
   } else {
     return returnvalue::FAILED;