diff --git a/Source/CTest/cmCTestCoverageHandler.cxx b/Source/CTest/cmCTestCoverageHandler.cxx
index ef071b9b80..33b084e84f 100644
--- a/Source/CTest/cmCTestCoverageHandler.cxx
+++ b/Source/CTest/cmCTestCoverageHandler.cxx
@@ -142,6 +142,7 @@ void cmCTestCoverageHandler::Initialize()
   this->Superclass::Initialize();
   this->CustomCoverageExclude.clear();
   this->SourceLabels.clear();
+  this->TargetDirs.clear();
   this->LabelIdMap.clear();
   this->Labels.clear();
   this->LabelFilter.clear();