diff --git a/tools/build_mwpfh.py b/tools/build_mwpfh.py
index a090b4d..4a86241 100644
--- a/tools/build_mwpfh.py
+++ b/tools/build_mwpfh.py
@@ -6,7 +6,7 @@ import os
 
 path = os.path.split(__file__)[0]
 if path:
-	os.chdir(path)
+    os.chdir(path)
 
 environments = ['26', '27', '32', '33', '34']
 
@@ -15,29 +15,29 @@ target = "pypi" if "--push" in sys.argv else "test"
 returnvalues = {}
 
 def run(pyver, cmds, target=None):
-	cmd = [r"C:\Python%s\Python.exe" % pyver, "setup.py"] + cmds
-	if target:
-		cmd += ["-r", target]
-
-	print(" ".join(cmd), end=" ")
-	retval = subprocess.call(cmd, stdout=open("%s%s.log" % (cmds[0], pyver), 'w'), stderr=subprocess.STDOUT, cwd="..")
-	if not retval:
-		print("[OK]")
-	else:
-		print("[FAILED (%i)]" % retval)
-	return retval
+cmd = [r"C:\Python%s\Python.exe" % pyver, "setup.py"] + cmds
+if target:
+    cmd += ["-r", target]
+
+print(" ".join(cmd), end=" ")
+retval = subprocess.call(cmd, stdout=open("%s%s.log" % (cmds[0], pyver), 'w'), stderr=subprocess.STDOUT, cwd="..")
+if not retval:
+    print("[OK]")
+else:
+    print("[FAILED (%i)]" % retval)
+return retval
 
 run("27", ["register"], target)
 
 if 'failed' in open('register27.log').read():
-	raise Exception
+    raise Exception
 
 for pyver in environments:
-	print()
-	try:
-		os.unlink('mwparserfromhell/parser/_tokenizer.pyd')
-	except WindowsError:
-		pass
-	
-	if run(pyver, ["test"]) == 0:
-		run(pyver, ["bdist_wheel", "upload"], target)
\ No newline at end of file
+    print()
+    try:
+        os.unlink('mwparserfromhell/parser/_tokenizer.pyd')
+    except WindowsError:
+        pass
+    
+    if run(pyver, ["test"]) == 0:
+        run(pyver, ["bdist_wheel", "upload"], target)