diff --git a/src/Groups.jl b/src/Groups.jl
index e8a219c..64d5c3a 100644
--- a/src/Groups.jl
+++ b/src/Groups.jl
@@ -345,7 +345,7 @@ function replace(W::GWord, index, toreplace::GWord, replacement::GWord)
 end
 
 function replace_all!{T}(W::GWord{T}, subst_dict::Dict{GWord{T}, GWord{T}})
-    for toreplace in reverse!(sort!(collect(keys(subst_dict)),by=length))
+    for toreplace in reverse!(sort!(collect(keys(subst_dict)), by=length))
         replacement = subst_dict[toreplace]
         i = findfirst(W, toreplace)
         while i ≠ 0