diff --git a/libsolidity/formal/SMTChecker.cpp b/libsolidity/formal/SMTChecker.cpp
index 912e2a69b..78591ad69 100644
--- a/libsolidity/formal/SMTChecker.cpp
+++ b/libsolidity/formal/SMTChecker.cpp
@@ -1371,7 +1371,7 @@ void SMTChecker::createExpr(Expression const& _e)
 void SMTChecker::defineExpr(Expression const& _e, smt::Expression _value)
 {
 	createExpr(_e);
-	solAssert(isSupportedType(*_e.annotation().type), "Equality operator applied to type that is not fully supported");
+	solAssert(smtKind(_e.annotation().type->category()) != smt::Kind::Function, "Equality operator applied to type that is not fully supported");
 	m_interface->addAssertion(expr(_e) == _value);
 }
 
diff --git a/test/libsolidity/smtCheckerTests/types/struct_1.sol b/test/libsolidity/smtCheckerTests/types/struct_1.sol
new file mode 100644
index 000000000..0cc5b1e41
--- /dev/null
+++ b/test/libsolidity/smtCheckerTests/types/struct_1.sol
@@ -0,0 +1,24 @@
+pragma experimental SMTChecker;
+
+contract C
+{
+	struct S {
+		uint x;
+	}
+
+	mapping (uint => S) smap;
+
+	function f(uint y, uint v) public {
+		smap[y] = S(v);
+		S memory smem = S(v);
+	}
+}
+// ----
+// Warning: (157-170): Unused local variable.
+// Warning: (157-170): Assertion checker does not yet support the type of this variable.
+// Warning: (139-146): Assertion checker does not yet implement this type.
+// Warning: (149-153): Assertion checker does not yet implement this expression.
+// Warning: (139-153): Assertion checker does not yet implement type struct C.S storage ref
+// Warning: (173-177): Assertion checker does not yet implement this expression.
+// Warning: (173-177): Internal error: Expression undefined for SMT solver.
+// Warning: (173-177): Assertion checker does not yet implement this type.