diff --git a/src/julia.h b/src/julia.h
index b4604ff86d00e6..28fb4916acfbb4 100644
--- a/src/julia.h
+++ b/src/julia.h
@@ -390,26 +390,8 @@ typedef struct _jl_code_instance_t {
     //TODO: uint8_t absolute_max; // whether true max world is unknown
 
     // purity results
-    union {
-        uint32_t ipo_purity_bits;
-        struct {
-            uint8_t ipo_consistent:2;
-            uint8_t ipo_effect_free:2;
-            uint8_t ipo_nothrow:2;
-            uint8_t ipo_terminates:2;
-            uint8_t ipo_nonoverlayed:1;
-        } ipo_purity_flags;
-    };
-    union {
-        uint32_t purity_bits;
-        struct {
-            uint8_t consistent:2;
-            uint8_t effect_free:2;
-            uint8_t nothrow:2;
-            uint8_t terminates:2;
-            uint8_t nonoverlayed:1;
-        } purity_flags;
-    };
+    uint32_t ipo_purity_bits;
+    uint32_t purity_bits;
     jl_value_t *argescapes; // escape information of call arguments
 
     // compilation state cache