diff --git a/cmake/FindTCL.cmake b/cmake/FindTCL.cmake
index 8f4c698c..f74aa620 100644
--- a/cmake/FindTCL.cmake
+++ b/cmake/FindTCL.cmake
@@ -74,3 +74,7 @@ if (NOT TCL_HEADER)
 endif()
 message(STATUS "TCL header: ${TCL_HEADER}")
 get_filename_component(TCL_HEADER_DIR "${TCL_HEADER}" PATH)
+
+if (TCL_HEADER)
+  get_filename_component(TCL_INCLUDE_PATH "${TCL_HEADER}" PATH)
+endif()