diff --git a/tree/dataframe/inc/ROOT/RDF/RInterface.hxx b/tree/dataframe/inc/ROOT/RDF/RInterface.hxx
index 139c6b764d534c68b4c12bacbf66adf9cb71fed0..2572df624e65675d862104b31ee21818249f599b 100644
--- a/tree/dataframe/inc/ROOT/RDF/RInterface.hxx
+++ b/tree/dataframe/inc/ROOT/RDF/RInterface.hxx
@@ -47,6 +47,9 @@ class TGraph;
 
 // Windows requires a forward decl of printValue to accept it as a valid friend function in RInterface
 namespace ROOT {
+void 	DisableImplicitMT ();
+bool 	IsImplicitMTEnabled ();
+void 	EnableImplicitMT (UInt_t numthreads);
 class RDataFrame;
 namespace Internal {
 namespace RDF {