Index: generic/nsfInt.h
===================================================================
diff -u -N -rb49b73b79d290426a2d112abaa18bb4b95dd9b2f -r95656d2638199a6292c1b2c9bc570c37020280b6
--- generic/nsfInt.h	(.../nsfInt.h)	(revision b49b73b79d290426a2d112abaa18bb4b95dd9b2f)
+++ generic/nsfInt.h	(.../nsfInt.h)	(revision 95656d2638199a6292c1b2c9bc570c37020280b6)
@@ -186,7 +186,7 @@
 #define DSTRING_FREE(dsPtr) \
   if ((dsPtr)->string != (dsPtr)->staticSpace) {Tcl_DStringFree(dsPtr);} MEM_COUNT_FREE("DString",(dsPtr))
 
-#if USE_ASSOC_DATA
+#if defined(USE_ASSOC_DATA)
 # define RUNTIME_STATE(interp) ((NsfRuntimeState*)Tcl_GetAssocData((interp), "NsfRuntimeState", NULL))
 #else
 # define RUNTIME_STATE(interp) ((NsfRuntimeState*)((Interp*)(interp))->globalNsPtr->clientData)