diff --git a/regress/jmp_ebx_hang.py b/regress/jmp_ebx_hang.py
index 21b057d2..1b78d89c 100755
--- a/regress/jmp_ebx_hang.py
+++ b/regress/jmp_ebx_hang.py
@@ -8,21 +8,26 @@ CODE = b'\xff\xe3'
 mu = unicorn.Uc(unicorn.UC_ARCH_X86, unicorn.UC_MODE_32)
 mu.mem_map(CODE_ADDR, 1024 * 4)
 mu.mem_write(CODE_ADDR, CODE)
+# If EBX is zero then an exception is raised, as expected
 mu.reg_write(unicorn.x86_const.UC_X86_REG_EBX, 0x0)
 
-print "jmp ebx, with ebx == 0"
 try:
     mu.emu_start(CODE_ADDR, CODE_ADDR + 2, count=1)
 except unicorn.UcError as e:
-    print "Error: %s" % e
+    assert(e.errno == unicorn.UC_ERR_CODE_INVALID)
+else:
+    assert(False)
 
 mu = unicorn.Uc(unicorn.UC_ARCH_X86, unicorn.UC_MODE_32)
 mu.mem_map(CODE_ADDR, 1024 * 4)
 # If we write this address to EBX then the emulator hangs on emu_start
 mu.reg_write(unicorn.x86_const.UC_X86_REG_EBX, 0xaa96a47f)
 mu.mem_write(CODE_ADDR, CODE)
-print "jmp ebx, with ebx == 0xaa96a47f"
 try:
     mu.emu_start(CODE_ADDR, CODE_ADDR + 2, count=1)
 except unicorn.UcError as e:
-    print "Error: %s" % e
+    assert(e.errno == unicorn.UC_ERR_CODE_INVALID)
+else:
+    assert(False)
+
+print "Success"