diff --git a/Tests/CustomCommandWorkingDirectory/CMakeLists.txt b/Tests/CustomCommandWorkingDirectory/CMakeLists.txt
index 48437ec37..4ddc87a55 100644
--- a/Tests/CustomCommandWorkingDirectory/CMakeLists.txt
+++ b/Tests/CustomCommandWorkingDirectory/CMakeLists.txt
@@ -2,7 +2,7 @@ PROJECT(TestWorkingDir)
 
 ADD_CUSTOM_COMMAND(
   OUTPUT "${TestWorkingDir_BINARY_DIR}/working.c"
-  COMMAND "${CMAKE_COMMAND}" -E copy ./working.c "${TestWorkingDir_BINARY_DIR}/working.c"
+  COMMAND "${CMAKE_COMMAND}" -E copy ./working.c.in "${TestWorkingDir_BINARY_DIR}/working.c"
   WORKING_DIRECTORY "${TestWorkingDir_SOURCE_DIR}"
   COMMENT "custom command"
 )
diff --git a/Tests/CustomCommandWorkingDirectory/working.c b/Tests/CustomCommandWorkingDirectory/working.c.in
similarity index 100%
rename from Tests/CustomCommandWorkingDirectory/working.c
rename to Tests/CustomCommandWorkingDirectory/working.c.in