diff --git a/regress/block_test.c b/regress/block_test.c
index 9d74d199..cc372fed 100755
--- a/regress/block_test.c
+++ b/regress/block_test.c
@@ -18,7 +18,7 @@ void cb_hookblock(uch handle, uint64_t address, uint32_t size, void *user_data)
       fprintf(stderr, "not ok %d - address != 0x1000000 && address != 0x1000200\n", count++);
       _exit(1);
    }
-   fprintf(stderr, "ok %d - address (0x%x) is start of basic block\n", count++, address);
+   fprintf(stderr, "ok %d - address (0x%x) is start of basic block\n", count++, (uint32_t)address);
    if (size != 0x200) {
       fprintf(stderr, "not ok %d - basic block size != 0x200\n", count++);
       _exit(1);
diff --git a/regress/memmap_segfault2.py b/regress/memmap_segfault2.py
new file mode 100644
index 00000000..39dd9a64
--- /dev/null
+++ b/regress/memmap_segfault2.py
@@ -0,0 +1,6 @@
+from unicorn import *
+uc = Uc(UC_ARCH_X86, UC_MODE_32)
+uc.mem_map(0x0000, 0x2000)
+uc.mem_map(0x2000, 0x4000)
+uc.mem_write(0x1000, 0x1004 * ' ')
+print 'Not reached on x86_64 Linux.'