diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 1696949bce..ceef6c5d13 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -133,6 +133,7 @@ ADD_LIBRARY(IfcParse STATIC
   ../src/ifcparse/IfcHierarchyHelper.cpp
   ../src/ifcparse/IfcLateBoundEntity.cpp
   ../src/ifcparse/IfcParse.cpp
+  ../src/ifcparse/IfcSIPrefix.cpp
   ../src/ifcparse/IfcSpfHeader.cpp
   ../src/ifcparse/IfcUtil.cpp
   ../src/ifcparse/IfcWrite.cpp
@@ -147,7 +148,6 @@ ADD_LIBRARY(IfcGeom STATIC
   ../src/ifcgeom/IfcGeomRenderStyles.cpp
   ../src/ifcgeom/IfcGeomRepresentation.cpp
   ../src/ifcgeom/IfcGeomShapes.cpp
-  ../src/ifcgeom/IfcGeomUtils.cpp
   ../src/ifcgeom/IfcGeomWires.cpp
   ../src/ifcgeom/IfcRegister.cpp
 )
@@ -193,7 +193,6 @@ SET(include_files_geom
     ../src/ifcgeom/IfcGeomMaterial.h
     ../src/ifcgeom/IfcGeomRenderStyles.h
     ../src/ifcgeom/IfcGeomRepresentation.h
-    ../src/ifcgeom/IfcGeomUtils.h
     ../src/ifcgeom/IfcRegister.h
     ../src/ifcgeom/IfcRegisterConvertCurve.h
     ../src/ifcgeom/IfcRegisterConvertFace.h
@@ -222,6 +221,7 @@ SET(include_files_parse
     ../src/ifcparse/IfcHierarchyHelper.h
     ../src/ifcparse/IfcLateBoundEntity.h
     ../src/ifcparse/IfcParse.h
+    ../src/ifcparse/IfcSIPrefix.h
     ../src/ifcparse/IfcSpfHeader.h
     ../src/ifcparse/IfcSpfStream.h
     ../src/ifcparse/IfcUtil.h
diff --git a/win/IfcGeom.vcproj b/win/IfcGeom.vcproj
index 44069b05af..22e36838c8 100644
--- a/win/IfcGeom.vcproj
+++ b/win/IfcGeom.vcproj
@@ -182,10 +182,6 @@
 				RelativePath="..\src\ifcgeom\IfcGeomShapes.cpp"
 				>
 			</File>
-			<File
-				RelativePath="..\src\ifcgeom\IfcGeomUtils.cpp"
-				>
-			</File>
 			<File
 				RelativePath="..\src\ifcgeom\IfcGeomWires.cpp"
 				>
@@ -228,10 +224,6 @@
 				RelativePath="..\src\ifcgeom\IfcGeomRepresentation.h"
 				>
 			</File>
-			<File
-				RelativePath="..\src\ifcgeom\IfcGeomUtils.h"
-				>
-			</File>
 			<File
 				RelativePath="..\src\ifcgeom\IfcRegister.h"
 				>
diff --git a/win/IfcParse.vcproj b/win/IfcParse.vcproj
index 3f81585a7a..5877088cb8 100644
--- a/win/IfcParse.vcproj
+++ b/win/IfcParse.vcproj
@@ -213,6 +213,10 @@
 				RelativePath="..\src\ifcparse\IfcWrite.cpp"
 				>
 			</File>
+			<File
+				RelativePath="..\src\ifcparse\IfcSIPrefix.cpp"
+				>
+			</File>
 			<File
 				RelativePath="..\src\ifcparse\IfcSpfHeader.cpp"
 				>
@@ -287,6 +291,10 @@
 				RelativePath="..\src\ifcparse\IfcParse.h"
 				>
 			</File>
+			<File
+				RelativePath="..\src\ifcparse\IfcSIPrefix.h"
+				>
+			</File>
 			<File
 				RelativePath="..\src\ifcparse\IfcSpfHeader.h"
 				>