diff --git a/Modules/FindTCL.cmake b/Modules/FindTCL.cmake
index f649ddc56..37e43d05a 100644
--- a/Modules/FindTCL.cmake
+++ b/Modules/FindTCL.cmake
@@ -172,6 +172,8 @@ set(TCLTK_POSSIBLE_INCLUDE_PATHS
   /usr/include/tcl8.3
   /usr/include/tcl8.2
   /usr/include/tcl8.0
+  /usr/local/include/tcl8.6
+  /usr/local/include/tk8.6
   /usr/local/include/tcl8.5
   /usr/local/include/tk8.5
   /usr/local/include/tcl8.4