diff --git a/vtkm/exec/FunctorBase.h b/vtkm/exec/FunctorBase.h
index 2971457d3..2346879ff 100644
--- a/vtkm/exec/FunctorBase.h
+++ b/vtkm/exec/FunctorBase.h
@@ -38,7 +38,7 @@ class FunctorBase
 {
 public:
   VTKM_EXEC_CONT_EXPORT
-  FunctorBase() {  }
+  FunctorBase(): ErrorMessage() {  }
 
   VTKM_EXEC_EXPORT
   void RaiseError(const char *message) const
diff --git a/vtkm/exec/internal/ErrorMessageBuffer.h b/vtkm/exec/internal/ErrorMessageBuffer.h
index 9d910b9b9..3d5c33025 100644
--- a/vtkm/exec/internal/ErrorMessageBuffer.h
+++ b/vtkm/exec/internal/ErrorMessageBuffer.h
@@ -41,7 +41,7 @@ class ErrorMessageBuffer
 {
 public:
   VTKM_EXEC_CONT_EXPORT ErrorMessageBuffer()
-    : MessageBuffer(), MessageBufferSize(0) {  }
+    : MessageBuffer(NULL), MessageBufferSize(0) {  }
 
   VTKM_EXEC_CONT_EXPORT
   ErrorMessageBuffer(char *messageBuffer, vtkm::Id bufferSize)