diff --git a/src/cuda/curnn.jl b/src/cuda/curnn.jl
index c37d031c..bbd4e122 100644
--- a/src/cuda/curnn.jl
+++ b/src/cuda/curnn.jl
@@ -158,11 +158,12 @@ function backwardData(rnn::RNNDesc{T}, y, dy_, dho, dco, h, c, reserve) where T
   dx = y isa AbstractVector ? similar(dy, rnn.input) : similar(dy, rnn.input, size(dy, 2))
   dh = similar(h)
   dc = c == nothing ? nothing : similar(c)
+  workspace = getworkspace(rnn, 1, yd)
   CUDNN.cudnnRNNBackwardData(handle(), rnn, 1,
     yd, y, yd, dy, hDesc(dho)..., hDesc(dco)...,
     FilterDesc(T, (1, 1, length(rnn.params))), rnn.params,
     hDesc(h)..., hDesc(c)..., xDesc(dx), dx, hDesc(dh)..., hDesc(dc)...,
-    workspace[], length(workspace[]), reserve, length(reserve))
+    workspace, length(workspace), reserve, length(reserve))
   return c == nothing ? (dx, dh) : (dx, dh, dc)
 end