diff --git a/stepmania/src/RageDisplay_D3D.cpp b/stepmania/src/RageDisplay_D3D.cpp
index 3f6b52af38..58408821e3 100644
--- a/stepmania/src/RageDisplay_D3D.cpp
+++ b/stepmania/src/RageDisplay_D3D.cpp
@@ -759,7 +759,7 @@ public:
 			{
 				for( unsigned j=0; j<Triangles.size(); j++ )
 					for( unsigned k=0; k<3; k++ )
-						m_vTriangles[meshInfo.iTriangleStart+j].nVertexIndices[k] = meshInfo.iVertexStart + Triangles[j].nVertexIndices[k];
+						m_vTriangles[meshInfo.iTriangleStart+j].nVertexIndices[k] = (word)meshInfo.iVertexStart + Triangles[j].nVertexIndices[k];
 			}
 		}
 	}