diff --git a/ApplicationCode/ProjectDataModel/RimObservedDataCollection.cpp b/ApplicationCode/ProjectDataModel/RimObservedDataCollection.cpp
index c337d02816..41090dc5fb 100644
--- a/ApplicationCode/ProjectDataModel/RimObservedDataCollection.cpp
+++ b/ApplicationCode/ProjectDataModel/RimObservedDataCollection.cpp
@@ -16,7 +16,6 @@
 //
 /////////////////////////////////////////////////////////////////////////////////
 
-#pragma once
 
 #include "RimObservedDataCollection.h"
 #include "RimObservedData.h"