diff --git a/R/sybilSBML.R b/R/sybilSBML.R
index 7b282c05327b8cbbe531cf7328e344209fda9379..b3eb40bee432ac7871489f4779c8fd2d086de6b1 100644
--- a/R/sybilSBML.R
+++ b/R/sybilSBML.R
@@ -562,7 +562,6 @@ writeSBML<- function(morg=NULL,level=2,version=4,fbcLevel=0,filename="export.xml
                   react_notes,
                   react_anno,
                   ex_react,
-                  as.logical(validation),
                   as.character(deformatGene(allgenes))
   )
 # SUCESS MESSAGES