diff --git a/src/eval/eval_bundles.c b/src/eval/eval_bundles.c
index 98f5c5f7..d4ade515 100644
--- a/src/eval/eval_bundles.c
+++ b/src/eval/eval_bundles.c
@@ -170,7 +170,7 @@ e_value_eval_from_eval(E_Eval eval)
           U64 valid_bits_mask = 0;
           for(U64 idx = 0; idx < type->count; idx += 1)
           {
-            valid_bits_mask |= (1<<idx);
+            valid_bits_mask |= (1ull<<idx);
           }
           eval.value.u64 = eval.value.u64 >> type->off;
           eval.value.u64 = eval.value.u64 & valid_bits_mask;
diff --git a/src/mule/mule_c.c b/src/mule/mule_c.c
index 2836ec39..92492aba 100644
--- a/src/mule/mule_c.c
+++ b/src/mule/mule_c.c
@@ -91,6 +91,13 @@ struct TypeWithBitfield
   int z : 10;
 };
 
+typedef struct BitfieldType64 BitfieldType64;
+struct BitfieldType64
+{
+  uint64_t size    : 63;
+  uint64_t is_free : 1;
+};
+
 void
 c_type_with_bitfield_usage(void)
 {
@@ -103,4 +110,8 @@ c_type_with_bitfield_usage(void)
   int x = (b.v + b.x);
   int y = (b.y - b.z);
   int z = (b.w) + 5;
+  BitfieldType64 b64 = {0};
+  b64.size = 524288;
+  b64.is_free = 1;
+  int abc = 0;
 }