diff --git a/Fit/3rdParty/RootMinimizers/mathcore/Math/GSLMultiFitFunctionWrapper.h b/Fit/3rdParty/RootMinimizers/mathcore/Math/GSLMultiFitFunctionWrapper.h
index e0bc9320a59423c56d1f3e0c39eeb2bbd48371ec..f4ac7cc48433cb07c17c613a55cf5836ed764ce3 100644
--- a/Fit/3rdParty/RootMinimizers/mathcore/Math/GSLMultiFitFunctionWrapper.h
+++ b/Fit/3rdParty/RootMinimizers/mathcore/Math/GSLMultiFitFunctionWrapper.h
@@ -32,10 +32,9 @@
 #define ROOT_Math_GSLMultiFitFunctionWrapper
 
 #include "gsl/gsl_multifit.h"
+#include "gsl/gsl_multifit_nlin.h" // patch JWu dec20
 
 #include "GSLMultiFitFunctionAdapter.h"
-
-
 #include <cassert>
 
 namespace ROOT {