diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index a267f0f5b8..e1a23b4ed2 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -747,9 +747,9 @@ void FullCodeGenerator::EmitDeclaration(Variable* variable,
         __ li(a2, Operand(variable->name()));
         // Declaration nodes are always introduced in one of two modes.
         ASSERT(mode == Variable::VAR ||
-               mode == Variable::CONST);
-        PropertyAttributes attr =
-            (mode == Variable::VAR) ? NONE : READ_ONLY;
+               mode == Variable::CONST ||
+               mode == Variable::LET);
+        PropertyAttributes attr = (mode == Variable::CONST) ? READ_ONLY : NONE;
         __ li(a1, Operand(Smi::FromInt(attr)));
         // Push initial value, if any.
         // Note: For variables we must not push an initial value (such as