diff --git a/opencv/components/TkCalibGUI/CMakeLists.txt b/opencv/components/TkCalibGUI/CMakeLists.txt
index c524c12..689c8d6 100644
--- a/opencv/components/TkCalibGUI/CMakeLists.txt
+++ b/opencv/components/TkCalibGUI/CMakeLists.txt
@@ -65,7 +65,11 @@ set(RTC_VERSION "${TkCalibGUI_VERSION}")
 set(RTC_VERSION_MAJOR "${TkCalibGUI_VERSION_MAJOR}")
 set(RTC_VERSION_MINOR "${TkCalibGUI_VERSION_MINOR}")
 set(RTC_VERSION_PATCH "${TkCalibGUI_VERSION_PATCH}")
-set(RTC_LANG "python")
+if(WIN32)
+    set(RTC_LANG "python")
+else()
+    set(RTC_LANG "python3")
+endif()
 set(RTC_DESCRIPTION "Image Calibration GUI")
 set(RTC_VENDOR "AIST")
 set(RTC_MAINTAINER "Noriaki Ando <n-ando@aist.go.jp>")