diff --git a/src/common/IvGraphics/D3D11/IvConstantTableD3D11.h b/src/common/IvGraphics/D3D11/IvConstantTableD3D11.h
index 3449112..aeff358 100644
--- a/src/common/IvGraphics/D3D11/IvConstantTableD3D11.h
+++ b/src/common/IvGraphics/D3D11/IvConstantTableD3D11.h
@@ -18,6 +18,7 @@
 //-------------------------------------------------------------------------------
 #include <d3d11.h>
 #include <map>
+#include <string>
 
 #include "IvUniform.h"
 
@@ -101,4 +102,4 @@ class IvConstantTableD3D11
 //-- Externs --------------------------------------------------------------------
 //-------------------------------------------------------------------------------
 
-#endif
\ No newline at end of file
+#endif