diff --git a/src/CoinOptServices.jl b/src/CoinOptServices.jl
index 5496206..4304bec 100644
--- a/src/CoinOptServices.jl
+++ b/src/CoinOptServices.jl
@@ -293,9 +293,16 @@ function MathProgBase.loadproblem!(outer::OsilNonlinearModel,
     end
     while nextrowlinear
         constrexpr = MathProgBase.constr_expr(d, row)
-        @assertequal(constrexpr.head, :comparison)
+
+        if VERSION < v"0.5.0-dev+3231"
+            @assertequal(constrexpr.head, :comparison)
+            constrlinpart = constrexpr.args[end - 2]
+        else
+            @assertequal(constrexpr.head, :call)
+            constrlinpart = constrexpr.args[2]
+        end
+
         #(lhs, rhs) = constr2bounds(constrexpr.args...)
-        constrlinpart = constrexpr.args[end - 2]
         @assertequal(constrlinpart.head, :call)
         constrlinargs = constrlinpart.args
         @assertequal(constrlinargs[1], :+)
@@ -341,9 +348,15 @@ function MathProgBase.loadproblem!(outer::OsilNonlinearModel,
             nl = new_child(nonlinearExpressions, "nl")
             set_attribute(nl, "idx", row - 1) # OSiL is 0-based
             constrexpr = MathProgBase.constr_expr(d, row)
-            @assertequal(constrexpr.head, :comparison)
             #(lhs, rhs) = constr2bounds(constrexpr.args...)
-            expr2osnl!(nl, constrexpr.args[end - 2])
+            if VERSION >= v"0.5.0-dev+3231" && constrexpr.head == :call
+                @assert(constrexpr.args[1] in [:<=, :(==), :>=])
+                constrpart = constrexpr.args[2]
+            else
+                @assertequal(constrexpr.head, :comparison)
+                constrpart = constrexpr.args[end - 2]
+            end
+            expr2osnl!(nl, constrpart)
         end
     end
 
diff --git a/src/translations.jl b/src/translations.jl
index eb74c21..91737da 100644
--- a/src/translations.jl
+++ b/src/translations.jl
@@ -20,7 +20,17 @@ jl2osnl_binary = Dict(
     :rem   => "rem",
     :^     => "power",
     :.^    => "power",
-    :log   => "log")
+    :log   => "log",
+    :<     => "lt",
+    :<=    => "leq",
+    :≤     => "leq",
+    :>     => "gt",
+    :>=    => "geq",
+    :≥     => "geq",
+    :(==)  => "eq",
+    :!=    => "neq",
+    :≠     => "neq")
+# and, or, xor, not?
 
 jl2osnl_unary = Dict(
     :-     => "negate",
@@ -48,17 +58,19 @@ for op in [:abs, :sqrt, :floor, :factorial, :exp, :sign, :erf,
     jl2osnl_unary[op] = string(op)
 end
 
-jl2osnl_comparison = Dict(
-    :<     => "lt",
-    :<=    => "leq",
-    :≤     => "leq",
-    :>     => "gt",
-    :>=    => "geq",
-    :≥     => "geq",
-    :(==)  => "eq",
-    :!=    => "neq",
-    :≠     => "neq")
-# and, or, xor, not?
+if VERSION < v"0.5.0-dev+3231"
+    jl2osnl_comparison = Dict(
+        :<     => "lt",
+        :<=    => "leq",
+        :≤     => "leq",
+        :>     => "gt",
+        :>=    => "geq",
+        :≥     => "geq",
+        :(==)  => "eq",
+        :!=    => "neq",
+        :≠     => "neq")
+    # and, or, xor, not?
+end
 
 jl2osil_vartypes = Dict(:Cont => "C", :Int => "I", :Bin => "B",
     :SemiCont => "D", :SemiInt => "J", :Fixed => "C")
@@ -155,7 +167,7 @@ function expr2osnl!(parent, ex::Expr)
     elseif head == :ref
         child = var2osnl!(parent, args)
     elseif head == :comparison
-        if numargs == 3
+        if VERSION < v"0.5.0-dev+3231" && numargs == 3
             if haskey(jl2osnl_comparison, args[2])
                 child = new_child(parent, jl2osnl_comparison[args[2]])
                 expr2osnl!(child, args[1])