Index: generic/nsf.c
===================================================================
diff -u -r4344f09a497442a67dd503dcdce348a376491749 -rf8749ea35fec22e747e070825ff094c4f2725071
--- generic/nsf.c	(.../nsf.c)	(revision 4344f09a497442a67dd503dcdce348a376491749)
+++ generic/nsf.c	(.../nsf.c)	(revision f8749ea35fec22e747e070825ff094c4f2725071)
@@ -12636,7 +12636,6 @@
               ObjStr(callInfoObj)); */
       result = DispatchUnknownMethod(interp, invokedObject, objc-1, objv+1, callInfoObj,
                                      objv[1], NSF_CM_NO_OBJECT_METHOD|NSF_CSC_IMMEDIATE);
-      RUNTIME_STATE(interp)->unknown = 0;
       DECR_REF_COUNT(callInfoObj);
     }
   }
@@ -13040,10 +13039,6 @@
       result = DispatchUnknownMethod(interp, object,
 				     cscPtr->objc, cscPtr->objv, NULL, cscPtr->objv[0],
 				     (cscPtr->flags & NSF_CSC_CALL_NO_UNKNOWN)|NSF_CSC_IMMEDIATE);
-      /*
-       * Final reset of unknown flag
-       */
-      rst->unknown = 0;
     }
   }
 
@@ -13796,8 +13791,9 @@
  * Results:
  *    result code
  *
- * Side effects:
- *    indirect effects by calling Tcl code
+ * Side effects: 
+ *    There might be indirect effects by calling Tcl code; also,
+ *    the interp's unknown-state is reset.
  *
  *----------------------------------------------------------------------
  */
@@ -13809,6 +13805,7 @@
   int result;
   Tcl_Obj *unknownObj = NsfMethodObj(object, NSF_o_unknown_idx);
   CONST char *methodName = MethodName(methodObj);
+  NsfRuntimeState *rst = RUNTIME_STATE(interp);
 
   assert(interp);
   assert(object);
@@ -13870,6 +13867,11 @@
 			   tailMethodObj ? MethodName(tailMethodObj) : methodName);
   }
 
+  /*
+   * Reset interp state, unknown has been fired.
+   */
+  rst->unknown = 0;
+
   return result;
 }