diff --git a/OndselSolver/NewtonRaphson.cpp b/OndselSolver/NewtonRaphson.cpp
index f73c55f..2023125 100644
--- a/OndselSolver/NewtonRaphson.cpp
+++ b/OndselSolver/NewtonRaphson.cpp
@@ -112,7 +112,7 @@ bool NewtonRaphson::isConvergedToNumericalLimit()
 	size_t nDivergenceMax = 3;
 	auto dxNormIterNo = dxNorms->at(iterNo);
 	if (iterNo > 0) {
-		auto dxNormIterNoOld = dxNorms->at(iterNo);
+		auto dxNormIterNoOld = dxNorms->at(iterNo - 1);
 		auto farTooLargeError = dxNormIterNo > tooLargeTol;
 		auto worthIterating = dxNormIterNo > (smallEnoughTol * pow(10.0, (iterNo / iterMax) * nDecade));
 		bool stillConverging;