diff --git a/python/paddle/fluid/layers/detection.py b/python/paddle/fluid/layers/detection.py
index fc99ed31a9..25bada5cb3 100644
--- a/python/paddle/fluid/layers/detection.py
+++ b/python/paddle/fluid/layers/detection.py
@@ -1874,7 +1874,7 @@ def density_prior_box(input,
                  clip=True,
                  flatten_to_2d=True)
 
-            place = fluid.CPUPlace()
+	    place = fluid.CPUPlace()
 	    exe = fluid.Executor(place)
 	    exe.run(fluid.default_startup_program())