Index: generic/nsf.c
===================================================================
diff -u -N -r9e281d5110f397a9e9b8317325d0675f1793246d -r37833d2979f789fc14627e6c1f38ca3cb0ceac01
--- generic/nsf.c	(.../nsf.c)	(revision 9e281d5110f397a9e9b8317325d0675f1793246d)
+++ generic/nsf.c	(.../nsf.c)	(revision 37833d2979f789fc14627e6c1f38ca3cb0ceac01)
@@ -33536,7 +33536,7 @@
   nonnull_assert(object != NULL);
   nonnull_assert(class != NULL);
 
-  Tcl_SetBooleanObj(Tcl_GetObjResult(interp), (int)HasMixin(interp, object, class));
+  Tcl_SetBooleanObj(Tcl_GetObjResult(interp), (int)(HasMixin(interp, object, class)));
   return TCL_OK;
 }
 
@@ -33566,7 +33566,7 @@
   nonnull_assert(object != NULL);
   nonnull_assert(class != NULL);
 
-  Tcl_SetBooleanObj(Tcl_GetObjResult(interp), (int)IsSubType(object->cl, class));
+  Tcl_SetBooleanObj(Tcl_GetObjResult(interp), (int)(IsSubType(object->cl, class)));
   return TCL_OK;
 }