diff --git a/keras/backend/mxnet_backend.py b/keras/backend/mxnet_backend.py
index 206121bd7533..ce08f74a440f 100644
--- a/keras/backend/mxnet_backend.py
+++ b/keras/backend/mxnet_backend.py
@@ -2908,8 +2908,14 @@ def pool2d(x, pool_size, strides=(1, 1),
     if dim_ordering == 'default':
         dim_ordering = image_dim_ordering()
     x = _preprocess_convnd_input(x, dim_ordering)
+    
+    padding = (0, 0)
+    if border_mode == 'same':
+        padding, _, out_size = _preprocess_border_mode(border_mode, x.shape, pool_size, strides, (1,1))
+        border_mode = 'valid'
+
     s = mx.sym.Pooling(data=x.symbol, kernel=pool_size, pool_type=pool_mode, pooling_convention=border_mode,
-                       stride=strides)
+                       pad=padding, stride=strides)
     out = _postprocess_convnd_output(KerasSymbol(s), dim_ordering)
     return out
 
@@ -2932,8 +2938,14 @@ def pool3d(x, pool_size, strides=(1, 1, 1), border_mode='valid',
     if dim_ordering == 'default':
         dim_ordering = image_dim_ordering()
     x = _preprocess_convnd_input(x, dim_ordering)
+
+    padding = (0, 0, 0)
+    if border_mode == 'same':
+        padding, _, _ = _preprocess_border_mode(border_mode, x.shape, pool_size, strides, (1,1,1))
+        border_mode = 'valid'
+    
     s = mx.sym.Pooling(data=x.symbol, kernel=pool_size, pool_type=pool_mode, pooling_convention=border_mode,
-                       stride=strides)
+                       pad=padding, stride=strides)
     out = _postprocess_convnd_output(KerasSymbol(s), dim_ordering)
     return out