diff --git a/src/xlsout.jl b/src/xlsout.jl
index ff8f33d..ec3b8f9 100644
--- a/src/xlsout.jl
+++ b/src/xlsout.jl
@@ -593,7 +593,7 @@ function bivariatexls(df::AbstractDataFrame, colvar::Symbol, rowvars::Vector{Sym
 
             # colvar levels
             for i = 1:nlev
-                if i <= size(y,1) && y[i,:N] > 1
+                if i <= size(y,1) && y[i,:n] > 1
                     t.write(r,c+i*2+1,y[i,:mean],formats[:f_fmt_right])
                     t.write(r,c+i*2+2,y[i,:sd],formats[:f_fmt_left_parens])
                 else