diff --git a/tools/dtoc/fdt_util.py b/tools/dtoc/fdt_util.py
index 3e25a8b980e2ebf106a74ebc7c81729c7144d0c6..32f41d72d79238cf157697e57f95dc26161de7ae 100644
--- a/tools/dtoc/fdt_util.py
+++ b/tools/dtoc/fdt_util.py
@@ -22,7 +22,7 @@ def fdt32_to_cpu(val):
     Return:
         A native-endian integer value
     """
-    return struct.unpack(">I", val)[0]
+    return struct.unpack('>I', val)[0]
 
 def EnsureCompiled(fname):
     """Compile an fdt .dts source file into a .dtb binary blob if needed.