diff --git a/paddle/gserver/layers/DetectionOutputLayer.cpp b/paddle/gserver/layers/DetectionOutputLayer.cpp
index 274619ec608c8a7272dc9a942ee3aeca9a83878f..f9040f7ae746f9ae1736cd477d3a69a2c49e9d34 100644
--- a/paddle/gserver/layers/DetectionOutputLayer.cpp
+++ b/paddle/gserver/layers/DetectionOutputLayer.cpp
@@ -143,7 +143,7 @@ void DetectionOutputLayer::forward(PassType passType) {
     resetOutput(numKept, 7);
   } else {
     MatrixPtr outV = getOutputValue();
-    if (outV) outV->resize(0,0);
+    if (outV) outV->resize(0, 0);
     return;
   }
   MatrixPtr outV = getOutputValue();