diff --git a/CondFormats/MLObjects/BuildFile.xml b/CondFormats/MLObjects/BuildFile.xml
index 41d8361a81cf4..cc7b2d6f9ff1f 100644
--- a/CondFormats/MLObjects/BuildFile.xml
+++ b/CondFormats/MLObjects/BuildFile.xml
@@ -2,6 +2,7 @@
 <use name="PhysicsTools/ONNXRuntime"/>
 <use name="CondFormats/Serialization"/>
 <use name="boost_serialization"/>
+<use name="rootcling"/>
 <export>
   <lib name="1"/>
 </export>