diff --git a/fluid/Fl_Type.h b/fluid/Fl_Type.h
index e6968d13d..3ccbd0c54 100644
--- a/fluid/Fl_Type.h
+++ b/fluid/Fl_Type.h
@@ -141,4 +141,4 @@ const char *c_check(const char *c, int type = 0);
 // replace a string pointer with new value, strips leading/trailing blanks:
 int storestring(const char *n, const char * & p, int nostrip=0);
 
-extern bool include_H_from_C;
+extern int include_H_from_C;
diff --git a/fluid/Fl_Window_Type.cxx b/fluid/Fl_Window_Type.cxx
index d3fd4b323..cb52a46bb 100644
--- a/fluid/Fl_Window_Type.cxx
+++ b/fluid/Fl_Window_Type.cxx
@@ -21,7 +21,7 @@ int gridx = 5;
 int gridy = 5;
 int snap = 3;
 
-bool include_H_from_C;
+int include_H_from_C;
 
 void alignment_cb(Fl_Input *i, long v) {
   int n = atoi(i->value());