diff --git a/src/JuMP.jl b/src/JuMP.jl
index 7f688451351..cea3cc2289d 100644
--- a/src/JuMP.jl
+++ b/src/JuMP.jl
@@ -77,7 +77,7 @@ type Model
     colCat::Vector{Symbol}
 
     # Variable cones of the form, e.g. (:SDP, 1:9)
-    varCones::Vector{Tuple{Symbol,Any}}
+    varCones::Vector{@compat Tuple{Symbol,Any}}
 
     # Solution data
     objVal
@@ -144,7 +144,7 @@ function Model(;solver=UnsetSolver())
           Float64[],                   # colLower
           Float64[],                   # colUpper
           Symbol[],                    # colCat
-          Vector{Tuple{Symbol,Any}}[], # varCones
+          Vector{@compat Tuple{Symbol,Any}}[], # varCones
           0,                           # objVal
           Float64[],                   # colVal
           Float64[],                   # redCosts
@@ -496,7 +496,9 @@ end
 typealias AffExpr GenericAffExpr{Float64,Variable}
 
 AffExpr() = zero(AffExpr)
+# TODO: remove these when no longer supporting v0.3
 AffExpr(x::Union(Number,Variable)) = convert(AffExpr, x)
+AffExpr(x::AffExpr) = x
 
 Base.isempty(a::AffExpr) = (length(a.vars) == 0 && a.constant == 0.)
 Base.convert(::Type{AffExpr}, v::Variable) = AffExpr([v], [1.], 0.)