diff --git a/AutoCorrEstimator.cc b/AutoCorrEstimator.cc
index c664e69fbbf07172d2d615cdfe2eb3f8c946fd82..90c7c33c9bb9887287d475355fb1c778fddb32e2 100644
--- a/AutoCorrEstimator.cc
+++ b/AutoCorrEstimator.cc
@@ -465,7 +465,7 @@ namespace FILM {
     
     cerr << "Calculating raw AutoCorrs...";      
 
-    MISCMATHS::acorr(xdata, acEst, zeropad);
+    MISCMATHS::xcorr(xdata, acEst, zeropad);
 
     cerr << " Completed" << endl;  
   }