diff --git a/regress/fpu_mem_write.py b/regress/fpu_mem_write.py
index 730914a6..00e0b687 100755
--- a/regress/fpu_mem_write.py
+++ b/regress/fpu_mem_write.py
@@ -5,20 +5,21 @@ from unicorn.x86_const import *
 ESP = 0x2000
 PAGE_SIZE = 1 * 1024 * 1024
 
-# 	fstcw [esp]
-#	pop ecx
+#   wait
+#   fnstcw  word ptr [esp]
+#   pop ecx
 CODE = b'\x9B\xD9\x3C\x24\x59'
 
 def mem_reader(addr, size):
-	tmp = mu.mem_read(addr, size)
+    tmp = mu.mem_read(addr, size)
 
-	for i in tmp:
-		print(" 0x%x" % i),
-	print("")
+    for i in tmp:
+        print(" 0x%x" % i),
+    print("")
 
 def hook_mem_write(uc, access, address, size, value, user_data):
-	print("mem WRITE: 0x%x, data size = %u, data value = 0x%x" % (address, size, value))
-	return True
+    print("mem WRITE: 0x%x, data size = %u, data value = 0x%x" % (address, size, value))
+    return True
 
 mu = Uc(UC_ARCH_X86, UC_MODE_32)
 mu.mem_map(0, PAGE_SIZE)
@@ -26,7 +27,7 @@ mu.mem_write(0, CODE)
 mu.reg_write(UC_X86_REG_ESP, ESP)
 mu.hook_add(UC_HOOK_MEM_WRITE, hook_mem_write)
 
-mu.emu_start(0x0, 0, 0, 2)
+mu.emu_start(0x0, 5, 0, 2)
 esp = mu.reg_read(UC_X86_REG_ESP)
 print("value at ESP [0x%X]: " % esp)
-mem_reader(esp, 10)
\ No newline at end of file
+mem_reader(esp, 10)