diff --git a/workspaces/vc9/assimp.vcproj b/workspaces/vc9/assimp.vcproj
index 1678a0581..64a5cdcdc 100644
--- a/workspaces/vc9/assimp.vcproj
+++ b/workspaces/vc9/assimp.vcproj
@@ -2019,6 +2019,14 @@
 						RelativePath="..\..\code\STEPFile.h"
 						>
 					</File>
+					<File
+						RelativePath="..\..\code\STEPFileEncoding.cpp"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\STEPFileEncoding.h"
+						>
+					</File>
 					<File
 						RelativePath="..\..\code\STEPFileReader.cpp"
 						>