diff --git a/Project.toml b/Project.toml
index 03a3998..57dcb42 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "SymPy"
 uuid = "24249f21-da20-56a4-8eb1-6a02cf4ae2e6"
-version = "1.1.12"
+version = "1.1.13"
 
 [deps]
 CommonEq = "3709ef60-1bee-4518-9f2f-acd86f176c50"
diff --git a/src/types.jl b/src/types.jl
index 11b1306..6e9bc11 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -61,6 +61,7 @@ export Lambda
 ## this allows most things to flow though PyCall
 PyCall.PyObject(x::SymbolicObject) = x.__pyobject__
 ## Override this so that using symbols as keys in a dict works
+hash(x::SymbolicObject, h::UInt64) = hash(PyObject(x), h)
 hash(x::SymbolicObject) = hash(PyObject(x))
 ==(x::SymbolicObject, y::SymbolicObject) = PyObject(x) == PyObject(y)