--- a/src/colvarproxy_namd.C	2020-09-04 12:07:22.649591658 -0700
+++ b/src/colvarproxy_namd.C	2020-09-04 12:08:41.724079519 -0700
@@ -479,13 +479,13 @@
 
 // Callback functions
 
+#ifdef NAMD_TCL
 void colvarproxy_namd::init_tcl_pointers()
 {
-#ifdef NAMD_TCL
   // Store pointer to NAMD's Tcl interpreter
   _tcl_interp = reinterpret_cast<void *>(Node::Object()->getScript()->interp);
-#endif
 }
+#endif
 
 int colvarproxy_namd::run_force_callback()
 {