diff --git a/ssd.py b/ssd.py
index cd570064c..ef92e91a0 100644
--- a/ssd.py
+++ b/ssd.py
@@ -163,7 +163,7 @@ def add_extras(cfg, i, batch_norm=False):
 def multibox(vgg, extra_layers, cfg, num_classes):
     loc_layers = []
     conf_layers = []
-    vgg_source = [24, -2]
+    vgg_source = [21, -2]
     for k, v in enumerate(vgg_source):
         loc_layers += [nn.Conv2d(vgg[v].out_channels,
                                  cfg[k] * 4, kernel_size=3, padding=1)]