diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1e05424b7e..3e9366a7c6 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -501,6 +501,7 @@ SET (common_SRCS
     ${HDF5_SRC_DIR}/H5FO.c
     ${HDF5_SRC_DIR}/H5HP.c
     ${HDF5_SRC_DIR}/H5I.c
+    ${HDF5_SRC_DIR}/H5Itest.c
     ${HDF5_SRC_DIR}/H5L.c
     ${HDF5_SRC_DIR}/H5Lexternal.c
     ${HDF5_SRC_DIR}/H5MM.c
diff --git a/windows/proj/hdf5/hdf5.vcproj b/windows/proj/hdf5/hdf5.vcproj
index 350c2fe6bb..8a247cecc3 100644
--- a/windows/proj/hdf5/hdf5.vcproj
+++ b/windows/proj/hdf5/hdf5.vcproj
@@ -853,10 +853,14 @@
 				RelativePath="..\..\..\src\H5HP.c"
 				>
 			</File>
-			<File
-				RelativePath="..\..\..\src\H5I.c"
-				>
-			</File>
+            <File
+                RelativePath="..\..\..\src\H5I.c"
+                >
+            </File>
+            <File
+                RelativePath="..\..\..\src\H5Itest.c"
+                >
+            </File>
 			<File
 				RelativePath="..\..\..\src\H5L.c"
 				>
diff --git a/windows/proj/hdf5dll/hdf5dll.vcproj b/windows/proj/hdf5dll/hdf5dll.vcproj
index cfeacec975..abf4c0967f 100644
--- a/windows/proj/hdf5dll/hdf5dll.vcproj
+++ b/windows/proj/hdf5dll/hdf5dll.vcproj
@@ -944,6 +944,10 @@
 				RelativePath="..\..\..\src\H5I.c"
 				>
 			</File>
+            <File
+                RelativePath="..\..\..\src\H5Itest.c"
+                >
+            </File>
 			<File
 				RelativePath="..\..\..\src\H5L.c"
 				>