diff --git a/src/rt/RtraceSimulManager.h b/src/rt/RtraceSimulManager.h
index 8e50550e..22fcc2a7 100644
--- a/src/rt/RtraceSimulManager.h
+++ b/src/rt/RtraceSimulManager.h
@@ -1,4 +1,4 @@
-/* RCSid $Id: RtraceSimulManager.h,v 2.18 2024/11/19 20:39:40 greg Exp $ */
+/* RCSid $Id: RtraceSimulManager.h,v 2.19 2024/11/19 20:50:36 greg Exp $ */
 /*
  *  RtraceSimulManager.h
  *
@@ -140,10 +140,7 @@ class RtraceSimulManager : public RadSimulManager {
 				}
 				/// Set/change trace callback
 	void			SetTraceCall(RayReportCall *cb, void *cd = NULL) {
-					if (cb == traceCall) {
-						if (cb) tcData = cd;
-						return;
-					}
+					if ((cb == traceCall) & (cd == tcData)) return;
 					int	nt = NThreads();
 					if (nt > 1) SetThreadCount(1);
 					traceCall = cb;