diff --git a/GBRLikelihood/BuildFile.xml b/GBRLikelihood/BuildFile.xml
index b59bcca..f7500c9 100644
--- a/GBRLikelihood/BuildFile.xml
+++ b/GBRLikelihood/BuildFile.xml
@@ -1,5 +1,5 @@
 
-<flags CXXFLAGS="-O3 -ftree-loop-linear -floop-interchange -ffast-math -fopenmp -std=gnu++1y"/>
+<flags CXXFLAGS="-O3 -ftree-loop-linear -floop-interchange -ffast-math -fopenmp -std=gnu++17"/>
 <use name="root"/>
 <use name="rootgraphics"/>
 <use name="rootmath"/>