1 files changed, 2 insertions, 1 deletions

diff --git a/src/w32heap.c b/src/w32heap.c
index b40db430ea9..d947842474f 100644
--- a/src/w32heap.c
+++ b/src/w32heap.c
@@ -245,6 +245,7 @@ init_heap ()
           exit (1);
         }
 
+#if defined (NO_UNION_TYPE) && !defined (USE_LSB_TAG)
       /* Ensure that the addresses don't use the upper tag bits since
          the Lisp type goes there.  */
       if (((unsigned long) data_region_base & ~VALMASK) != 0)
@@ -252,7 +253,7 @@ init_heap ()
           printf ("Error: The heap was allocated in upper memory.\n");
           exit (1);
         }
-
+#endif
       data_region_end = data_region_base;
       real_data_region_end = data_region_end;
     }