Index: generic/nsf.c
===================================================================
diff -u -r33d063a3296efd044652cba8668e25cef4797b66 -r462bf8f1d53c0f2bcaa795f542e2f65cdab996b5
--- generic/nsf.c	(.../nsf.c)	(revision 33d063a3296efd044652cba8668e25cef4797b66)
+++ generic/nsf.c	(.../nsf.c)	(revision 462bf8f1d53c0f2bcaa795f542e2f65cdab996b5)
@@ -3925,7 +3925,7 @@
   nonnull_assert(methodObj != NULL);
   nonnull_assert(pcl != NULL);
 
-  if (strchr(ObjStr(methodObj), ' ') != NULL) {
+  if (NsfHasTclSpace(ObjStr(methodObj))) {
     lookupFunction = SearchComplexCMethod;
   } else {
     lookupFunction = SearchSimpleCMethod;