diff --git a/patch-vbmeta.py b/patch-vbmeta.py
index 0921e45..0b7f4e3 100644
--- a/patch-vbmeta.py
+++ b/patch-vbmeta.py
@@ -10,35 +10,35 @@
 FLAGS_TO_SET = b'\x03'
 
 
-### main program
-
-# if an argument is not provided
-if len(sys.argv) != 2:
-    sys.exit("Usage: python ./" + os.path.basename(__file__) + " <vbmeta-image>")
-
-# try reading the file with read/write to make sure it exists
-FILE = sys.argv[1]
-
-try:
-    fd = os.open(FILE, os.O_RDWR)
-except OSError:
-    sys.exit("Error reading file: " + FILE + ". File not modified. Exiting...")
-
-# making sure it's a vbmeta image by reading the magic bytes at the start of the file
-magic = os.read(fd, AVB_MAGIC_LEN)
-
-if (magic != AVB_MAGIC):
-    fd.close()
-    sys.exit("Error: The provided image is not a valid vbmeta image. File not modified. Exiting...")
-
-# set the disable-verity and disable-verification flags at offset 123
-try:
-    os.lseek(fd, FLAGS_OFFSET, os.SEEK_SET)
-    os.write(fd, FLAGS_TO_SET)
-except OSError:
-    fd.close()
-    sys.exit("Error: Failed when patching the vbmeta image. Exiting...")
-
-# end of program
-os.close(fd)
-print("Patching successful.")
\ No newline at end of file
+if __name__ == "__main__":
+
+    # if an argument is not provided
+    if len(sys.argv) != 2:
+        sys.exit("Usage: python ./" + os.path.basename(__file__) + " <vbmeta-image>")
+
+    # try reading the file with read/write to make sure it exists
+    FILE = sys.argv[1]
+
+    try:
+        fd = os.open(FILE, os.O_RDWR)
+    except OSError:
+        sys.exit("Error reading file: " + FILE + ". File not modified. Exiting...")
+
+    # making sure it's a vbmeta image by reading the magic bytes at the start of the file
+    magic = os.read(fd, AVB_MAGIC_LEN)
+
+    if (magic != AVB_MAGIC):
+        fd.close()
+        sys.exit("Error: The provided image is not a valid vbmeta image. File not modified. Exiting...")
+
+    # set the disable-verity and disable-verification flags at offset 123
+    try:
+        os.lseek(fd, FLAGS_OFFSET, os.SEEK_SET)
+        os.write(fd, FLAGS_TO_SET)
+    except OSError:
+        fd.close()
+        sys.exit("Error: Failed when patching the vbmeta image. Exiting...")
+
+    # end of program
+    os.close(fd)
+    print("Patching successful.")
\ No newline at end of file