Index: generic/nsfStack.c
===================================================================
diff -u -rd07aa68ec94789131c272386b8a972bef86bf754 -r4344f09a497442a67dd503dcdce348a376491749
--- generic/nsfStack.c	(.../nsfStack.c)	(revision d07aa68ec94789131c272386b8a972bef86bf754)
+++ generic/nsfStack.c	(.../nsfStack.c)	(revision 4344f09a497442a67dd503dcdce348a376491749)
@@ -312,10 +312,10 @@
  *
  *----------------------------------------------------------------------
  */
-static Tcl_CallFrame * CallStackNextFrameOfType(Tcl_CallFrame *framePtr, int flags) nonnull(1);
+static Tcl_CallFrame * CallStackNextFrameOfType(Tcl_CallFrame *framePtr, unsigned int flags) nonnull(1);
 
 static Tcl_CallFrame *
-CallStackNextFrameOfType(Tcl_CallFrame *framePtr, int flags) {
+CallStackNextFrameOfType(Tcl_CallFrame *framePtr, unsigned int flags) {
   assert(framePtr);
 
   for (; framePtr; framePtr = Tcl_CallFrame_callerPtr(framePtr)) {
@@ -1079,11 +1079,11 @@
  *----------------------------------------------------------------------
  */
 NSF_INLINE static void CscInit_(/*@notnull@*/ NsfCallStackContent *cscPtr, NsfObject *object, NsfClass *cl,
-	Tcl_Command cmd, int frameType, int flags) nonnull(1) nonnull(2);
+	Tcl_Command cmd, int frameType, unsigned int flags) nonnull(1) nonnull(2);
 
 NSF_INLINE static void
 CscInit_(/*@notnull@*/ NsfCallStackContent *cscPtr, NsfObject *object, NsfClass *cl,
-	Tcl_Command cmd, int frameType, int flags) {
+	Tcl_Command cmd, int frameType, unsigned int flags) {
 #if defined(NSF_PROFILE)
   struct timeval trt;
 #endif
@@ -1272,7 +1272,7 @@
   if (object) {
     fprintf(stderr, "BeginOfCallChain obj %s\n", ObjectName(object));
     for (; varFramePtr; varFramePtr = Tcl_CallFrame_callerPtr(varFramePtr)) {
-      register int flags = Tcl_CallFrame_isProcCallFrame(varFramePtr);
+      register unsigned int flags = Tcl_CallFrame_isProcCallFrame(varFramePtr);
 
       if (flags & (FRAME_IS_NSF_METHOD|FRAME_IS_NSF_CMETHOD)) {
 	NsfCallStackContent *cscPtr = (NsfCallStackContent *)Tcl_CallFrame_clientData(varFramePtr);