diff --git a/src/cgutils.cpp b/src/cgutils.cpp
index ee71e8bda810d..3ddcf7a8d6653 100644
--- a/src/cgutils.cpp
+++ b/src/cgutils.cpp
@@ -1361,7 +1361,7 @@ static jl_cgval_t emit_getfield_knownidx(const jl_cgval_t &strct, unsigned idx,
             LLVM37_param(cast<PointerType>(strct.V->getType()->getScalarType())->getElementType())
             strct.V, 0, idx);
         assert(!jt->mutabl);
-        return typed_load(addr, NULL, jfty, ctx, NULL);
+        return typed_load(addr, NULL, jfty, ctx, tbaa_immut);
     }
     else {
         assert(strct.V->getType()->isVectorTy());