diff --git a/src/BeefBLUP.jl b/src/BeefBLUP.jl
index 4216ba8..e05c33b 100755
--- a/src/BeefBLUP.jl
+++ b/src/BeefBLUP.jl
@@ -74,8 +74,8 @@ fixedfx = select(data, Not([:id, :birthdate, :sire, :dam]))[:,1:end-1]
 # Find any columns that need to be deleted
 for i in 1:ncol(fixedfx)
     if length(unique(fixedfx[:,i])) <= 1
-        @warn string("column '", names(fixedfx[i]), "' does not have any unique animals and will be removed from this analysis")
-        deletecols!(fixedfx,i)
+        @warn string("column '", names(fixedfx)[i], "' does not have any unique animals and will be removed from this analysis")
+        select!(fixedfx,Not(i))
     end
 end