diff --git a/Alignment/OfflineValidation/bin/DiMuonVmerge.cc b/Alignment/OfflineValidation/bin/DiMuonVmerge.cc
index 7f9d4575f1363..7c522b8472067 100644
--- a/Alignment/OfflineValidation/bin/DiMuonVmerge.cc
+++ b/Alignment/OfflineValidation/bin/DiMuonVmerge.cc
@@ -15,6 +15,7 @@
 
 #include "TString.h"
 #include "TASImage.h"
+#include "TGraph.h"
 
 #include "Alignment/OfflineValidation/macros/loopAndPlot.C"
 #include "Alignment/OfflineValidation/interface/TkAlStyle.h"