diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 42b4e6ef..4355fcee 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1285,12 +1285,12 @@ static float computePeakRatio(signalVector *corr,
   complex *peak;
   float rms, avg = 0.0;
 
-  peak = corr->begin() + (int) rint(toa);
-
   /* Check for bogus results */
   if ((toa < 0.0) || (toa > corr->size()))
     return 0.0;
 
+  peak = corr->begin() + (int) rint(toa);
+
   for (int i = 2 * sps; i <= 5 * sps; i++) {
     if (peak - i >= corr->begin()) {
       avg += (peak - i)->norm2();