diff --git a/src/storm-dft/builder/ExplicitDFTModelBuilderApprox.cpp b/src/storm-dft/builder/ExplicitDFTModelBuilderApprox.cpp
index 8483aa3fd..84eaa21a7 100644
--- a/src/storm-dft/builder/ExplicitDFTModelBuilderApprox.cpp
+++ b/src/storm-dft/builder/ExplicitDFTModelBuilderApprox.cpp
@@ -177,7 +177,7 @@ namespace storm {
                         approximationThreshold = dft.nrElements()+10;
                         break;
                     case storm::builder::ApproximationHeuristic::DEPTH:
-                        approximationThreshold = iteration;
+                        approximationThreshold = iteration + 1;
                         break;
                     case storm::builder::ApproximationHeuristic::PROBABILITY:
                     case storm::builder::ApproximationHeuristic::BOUNDDIFFERENCE: