diff --git a/src/datatype.c b/src/datatype.c
index c635d5413b902..c0683aca5bd20 100644
--- a/src/datatype.c
+++ b/src/datatype.c
@@ -518,11 +518,10 @@ void jl_compute_field_offsets(jl_datatype_t *st)
     // now finish deciding if this instantiation qualifies for special properties
     assert(!isbitstype || st->layout->npointers == 0); // the definition of isbits
     if (isinlinealloc && st->layout->npointers > 0) {
-        //if (st->ninitialized != nfields)
-        //    isinlinealloc = 0;
-        //else if (st->layout->fielddesc_type != 0) // GC only implements support for this
-        //    isinlinealloc = 0;
-        isinlinealloc = 0;
+        if (st->ninitialized != nfields)
+            isinlinealloc = 0;
+        else if (st->layout->fielddesc_type != 0) // GC only implements support for this
+            isinlinealloc = 0;
     }
     st->isbitstype = isbitstype;
     st->isinlinealloc = isinlinealloc;