diff --git a/src/frameworks/cuda/mod.rs b/src/frameworks/cuda/mod.rs
index 16c95f9..baa5459 100644
--- a/src/frameworks/cuda/mod.rs
+++ b/src/frameworks/cuda/mod.rs
@@ -154,19 +154,6 @@ impl ConvForwardAlgo {
         };
         Ok(ConvForwardAlgo::from_cudnn(&algo))
     }
-
-    /// Check if the algo needs a cudnn workspace.
-    fn needs_cudnn_workspace(&self) -> Result<bool, ::co::error::Error> {
-        Ok(match *self {
-            ConvForwardAlgo::Auto => return Err(::co::error::Error::Plugin(::co::plugin::Error::Plugin("Can't check necessary workspace size for ConvForwardAlgo::Auto. Use `find_cudnn_algo` to find an algorithm."))),
-            ConvForwardAlgo::GEMM => true,
-            ConvForwardAlgo::ImplicitGEMM => false,
-            ConvForwardAlgo::ImplicitPrecompiledGEMM => true,
-            ConvForwardAlgo::FFT => true,
-            ConvForwardAlgo::FFTTiling => true,
-            ConvForwardAlgo::Direct => true,
-        })
-    }
 }
 
 impl ConvBackwardFilterAlgo {
@@ -209,17 +196,6 @@ impl ConvBackwardFilterAlgo {
         };
         Ok(ConvBackwardFilterAlgo::from_cudnn(&algo))
     }
-
-    /// Check if the algo needs a cudnn workspace.
-    fn needs_cudnn_workspace(&self) -> Result<bool, ::co::error::Error> {
-        Ok(match *self {
-            ConvBackwardFilterAlgo::Auto => return Err(::co::error::Error::Plugin(::co::plugin::Error::Plugin("Can't check necessary workspace size for ConvBackwardFilterAlgo::Auto. Use `find_cudnn_algo` to find an algorithm."))),
-            ConvBackwardFilterAlgo::ImplicitGEMM => false,
-            ConvBackwardFilterAlgo::ImplicitGEMMSum => true,
-            ConvBackwardFilterAlgo::ImplicitPrecompiledGEMMSum => true,
-            ConvBackwardFilterAlgo::FFT => true,
-        })
-    }
 }
 
 impl ConvBackwardDataAlgo {
@@ -262,17 +238,6 @@ impl ConvBackwardDataAlgo {
         };
         Ok(ConvBackwardDataAlgo::from_cudnn(&algo))
     }
-
-    /// Check if the algo needs a cudnn workspace.
-    fn needs_cudnn_workspace(&self) -> Result<bool, ::co::error::Error> {
-        Ok(match *self {
-            ConvBackwardDataAlgo::Auto => return Err(::co::error::Error::Plugin(::co::plugin::Error::Plugin("Can't check necessary workspace size for ConvBackwardDataAlgo::Auto. Use `find_cudnn_algo` to find an algorithm."))),
-            ConvBackwardDataAlgo::ImplicitGEMM => false,
-            ConvBackwardDataAlgo::ImplicitGEMMSum => false,
-            ConvBackwardDataAlgo::FFT => true,
-            ConvBackwardDataAlgo::FFTTiling => true,
-        })
-    }
 }
 
 macro_rules! impl_convolution_for_cuda_backend {
@@ -304,13 +269,19 @@ macro_rules! impl_convolution_for_cuda_backend {
                 let useable_algo_bwd_filter = try!(algo_bwd_filter.find_cudnn_algo(&filter_desc, &conv_desc, &src_desc, &dest_desc));
                 let useable_algo_bwd_data = try!(algo_bwd_data.find_cudnn_algo(&filter_desc, &conv_desc, &src_desc, &dest_desc));
 
-                let workspace_size_fwd = API::get_convolution_forward_workspace_size(*CUDNN.id_c(), useable_algo_fwd.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
-                let workspace_size_bwd_filter = API::get_convolution_backward_filter_workspace_size(*CUDNN.id_c(), useable_algo_bwd_filter.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
-                // let workspace_size_bwd_data = API::get_convolution_backward_data_workspace_size(*CUDNN.id_c(), useable_algo_bwd_data.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
-                let workspace_size_bwd_data = match try!(useable_algo_bwd_data.needs_cudnn_workspace()) {
-                    false => 1,
-                    true => API::get_convolution_backward_data_workspace_size(*CUDNN.id_c(), useable_algo_bwd_data.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap(),
-                };
+                let mut workspace_size_fwd = API::get_convolution_forward_workspace_size(*CUDNN.id_c(), useable_algo_fwd.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
+                let mut workspace_size_bwd_filter = API::get_convolution_backward_filter_workspace_size(*CUDNN.id_c(), useable_algo_bwd_filter.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
+                let mut workspace_size_bwd_data = API::get_convolution_backward_data_workspace_size(*CUDNN.id_c(), useable_algo_bwd_data.as_cudnn().unwrap(), *filter_desc.id_c(), *conv_desc.id_c(), *src_desc.id_c(), *dest_desc.id_c()).unwrap();
+
+                if workspace_size_fwd == 0 {
+                    workspace_size_fwd = 8;
+                }
+                if workspace_size_bwd_filter == 0 {
+                    workspace_size_bwd_filter = 8;
+                }
+                if workspace_size_bwd_data == 0 {
+                    workspace_size_bwd_data = 8;
+                }
 
                 Ok(
                     ::cudnn::utils::ConvolutionConfig::new(