diff --git a/include/util.h b/include/util.h
index 6c98652bcb0471b00f0c8863d877741e742ec114..6a0a1ee9fc5b7988e94d7f3782df817c0a19cb23 100644
--- a/include/util.h
+++ b/include/util.h
@@ -14,6 +14,7 @@
 #include "TFitResult.h"
 #include "TFitResultPtr.h"
 #include "TString.h"
+#include "TH1.h"
 
 #include <Math/Vector4D.h>