diff --git a/Tests/EnforceConfig.cmake.in b/Tests/EnforceConfig.cmake.in
index c10d2a319..9a5f04231 100644
--- a/Tests/EnforceConfig.cmake.in
+++ b/Tests/EnforceConfig.cmake.in
@@ -27,3 +27,10 @@ IF(NOT CTEST_CONFIGURATION_TYPE AND CONFIG_REQUIRED)
   ENDIF(NOT CTEST_CONFIGURATION_TYPE)
   MESSAGE("Guessing configuration ${CTEST_CONFIGURATION_TYPE}")
 ENDIF(NOT CTEST_CONFIGURATION_TYPE AND CONFIG_REQUIRED)
+
+# Fake a user home directory to avoid polluting the real one.
+IF(DEFINED ENV{HOME})
+  SET(HOME "@CMake_BINARY_DIR@/Tests/CMakeFiles/TestHome")
+  FILE(MAKE_DIRECTORY "${HOME}")
+  SET(ENV{HOME} "${HOME}")
+ENDIF(DEFINED ENV{HOME})