diff --git a/candle-core/src/conv.rs b/candle-core/src/conv.rs
index 90bb5229..041bb6fb 100644
--- a/candle-core/src/conv.rs
+++ b/candle-core/src/conv.rs
@@ -1,6 +1,9 @@
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub(crate) struct ParamsConv1D {
     pub(crate) b_size: Option<usize>,
+    // Maybe we should have a version without l_in as this bit depends on the input and not only on
+    // the weights.
+    pub(crate) l_in: usize,
     pub(crate) c_out: usize,
     pub(crate) c_in: usize,
     pub(crate) k_size: usize,
@@ -9,13 +12,13 @@ pub(crate) struct ParamsConv1D {
 }
 
 impl ParamsConv1D {
-    pub(crate) fn l_out(&self, l_in: usize) -> usize {
+    pub(crate) fn l_out(&self) -> usize {
         let dilation = 1;
-        (l_in + 2 * self.padding - dilation * (self.k_size - 1) - 1) / self.stride + 1
+        (self.l_in + 2 * self.padding - dilation * (self.k_size - 1) - 1) / self.stride + 1
     }
 
-    pub(crate) fn out_dims(&self, l_in: usize) -> Vec<usize> {
-        let l_out = self.l_out(l_in);
+    pub(crate) fn out_dims(&self) -> Vec<usize> {
+        let l_out = self.l_out();
         match self.b_size {
             None => vec![self.c_out, l_out],
             Some(n) => vec![n, self.c_out, l_out],
diff --git a/candle-core/src/cpu_backend.rs b/candle-core/src/cpu_backend.rs
index 54002184..718b071c 100644
--- a/candle-core/src/cpu_backend.rs
+++ b/candle-core/src/cpu_backend.rs
@@ -202,6 +202,26 @@ fn copy_strided_src_<T: Copy + std::fmt::Display>(
     }
 }
 
+struct Conv1D<'a>(&'a crate::conv::ParamsConv1D);
+
+impl<'a> Map2 for Conv1D<'a> {
+    const OP: &'static str = "conv1d";
+    fn f<T: 'static + num_traits::Num + Copy>(
+        &self,
+        _inp: &[T],
+        _inp_l: &Layout,
+        _k: &[T],
+        _k_l: &Layout,
+    ) -> Result<Vec<T>> {
+        let p = self.0;
+        let l_out = p.l_out();
+        let out_elems = p.c_out * l_out * p.b_size.unwrap_or(1);
+        let dst = vec![T::zero(); out_elems];
+        // TODO: actually implement the ops.
+        Ok(dst)
+    }
+}
+
 struct MatMul((usize, usize, usize, usize));
 
 impl Map2 for MatMul {
@@ -629,12 +649,12 @@ impl CpuStorage {
 
     pub(crate) fn conv1d(
         &self,
-        _l: &Layout,
-        _kernel: &Self,
-        _kernel_l: &Layout,
-        _params: &crate::conv::ParamsConv1D,
+        l: &Layout,
+        kernel: &Self,
+        kernel_l: &Layout,
+        params: &crate::conv::ParamsConv1D,
     ) -> Result<Self> {
-        todo!()
+        Conv1D(params).map(self, l, kernel, kernel_l)
     }
 
     pub(crate) fn embedding(&self, ids_l: &Layout, rhs: &Self, rhs_l: &Layout) -> Result<Self> {
diff --git a/candle-core/src/tensor.rs b/candle-core/src/tensor.rs
index 590b81c4..25ab0a9b 100644
--- a/candle-core/src/tensor.rs
+++ b/candle-core/src/tensor.rs
@@ -444,6 +444,7 @@ impl Tensor {
         }
         let params = crate::conv::ParamsConv1D {
             b_size,
+            l_in,
             c_out,
             c_in,
             k_size,
@@ -463,7 +464,7 @@ impl Tensor {
         } else {
             None
         };
-        let out_dims = params.out_dims(l_in);
+        let out_dims = params.out_dims();
         Ok(from_storage(storage, out_dims, op, false))
     }