diff --git a/tcl_tk_options.gpr b/tcl_tk_options.gpr
index 103cb6a..ee2433a 100644
--- a/tcl_tk_options.gpr
+++ b/tcl_tk_options.gpr
@@ -49,7 +49,9 @@ abstract project Tcl_Tk_Options is
            );
 
       when "windows" =>
-         null;
+         C_Compiler_Switches := C_Compiler_Switches
+         & ("-IC:/ActiveTcl/include");
+
    end case;
 
    Platform_Linker_Options := ();
@@ -72,8 +74,9 @@ abstract project Tcl_Tk_Options is
       when "windows" =>
          Platform_Linker_Options := Platform_Linker_Options &
            (
-            "-ltk",
-            "-ltcl"
+            "-LC:/ActiveTcl/lib",
+            "-ltk86t",
+            "-ltcl86t"
            );
    end case;