diff --git a/Tests/SimpleInstall/CMakeLists.txt b/Tests/SimpleInstall/CMakeLists.txt
index b4787c82b..a228a159f 100644
--- a/Tests/SimpleInstall/CMakeLists.txt
+++ b/Tests/SimpleInstall/CMakeLists.txt
@@ -125,6 +125,16 @@ SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Test of packaging with cpack")
 SET(CPACK_PACKAGE_VENDOR "Kitware")
 SET(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/foo.h")
 
+IF(WIN32 AND NOT UNIX)
+  FIND_PROGRAM(NSIS_MAKENSIS NAMES makensis
+    PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS]
+    DOC "Where is makensis.exe located"
+    )
+  IF(NOT NSIS_MAKENSIS)
+    SET(CPACK_GENERATOR TGZ)
+  ENDIF(NOT NSIS_MAKENSIS)
+ENDIF(WIN32 AND NOT UNIX)
+
 SET(CPACK_PACKAGE_EXECUTABLES "SimpleInstall" "Simple Install")
 INCLUDE(CPack)
 
diff --git a/Tests/SimpleInstallS2/CMakeLists.txt b/Tests/SimpleInstallS2/CMakeLists.txt
index b4787c82b..a228a159f 100644
--- a/Tests/SimpleInstallS2/CMakeLists.txt
+++ b/Tests/SimpleInstallS2/CMakeLists.txt
@@ -125,6 +125,16 @@ SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Test of packaging with cpack")
 SET(CPACK_PACKAGE_VENDOR "Kitware")
 SET(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/foo.h")
 
+IF(WIN32 AND NOT UNIX)
+  FIND_PROGRAM(NSIS_MAKENSIS NAMES makensis
+    PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\NSIS]
+    DOC "Where is makensis.exe located"
+    )
+  IF(NOT NSIS_MAKENSIS)
+    SET(CPACK_GENERATOR TGZ)
+  ENDIF(NOT NSIS_MAKENSIS)
+ENDIF(WIN32 AND NOT UNIX)
+
 SET(CPACK_PACKAGE_EXECUTABLES "SimpleInstall" "Simple Install")
 INCLUDE(CPack)