diff --git a/src/jitlayers.h b/src/jitlayers.h
index 49030fbe8cbf0..43fdc9b83b89b 100644
--- a/src/jitlayers.h
+++ b/src/jitlayers.h
@@ -246,7 +246,7 @@ struct jl_codegen_params_t {
     SmallVector<cfunc_decl_t,0> cfuncs;
     std::map<void*, GlobalVariable*> global_targets;
     jl_array_t *temporary_roots = nullptr;
-    SmallSet<jl_value_t *, 0> temporary_roots_set;
+    SmallSet<jl_value_t *, 8> temporary_roots_set;
     std::map<std::tuple<jl_code_instance_t*,bool>, GlobalVariable*> external_fns;
     std::map<jl_datatype_t*, DIType*> ditypes;
     std::map<jl_datatype_t*, Type*> llvmtypes;