diff --git a/gsflow_develop/gsflow_modsim.vfproj b/gsflow_develop/gsflow_modsim.vfproj
index a1d227e9..ee00b7d6 100644
--- a/gsflow_develop/gsflow_modsim.vfproj
+++ b/gsflow_develop/gsflow_modsim.vfproj
@@ -112,6 +112,7 @@
 		<File RelativePath="..\GSFLOW\src\modflow\gwf2wel7_NWT.f"/>
 		<File RelativePath="..\GSFLOW\src\modflow\gwflakmodule_NWT.f"/>
 		<File RelativePath="..\GSFLOW\src\prms\gwflow.f90"/>
+		<File RelativePath="..\GSFLOW\src\gsflow\gwflow_inactive_cell.f90"/>
 		<File RelativePath="..\GSFLOW\src\modflow\gwfsfrmodule_NWT.f"/>
 		<File RelativePath="..\GSFLOW\src\modflow\gwfuzfmodule_NWT.f"/>
 		<File RelativePath="..\GSFLOW\src\modflow\hufutl7.f"/>