diff --git a/stm32-metapac-gen/src/lib.rs b/stm32-metapac-gen/src/lib.rs
index ff919d8b..5c2d605b 100644
--- a/stm32-metapac-gen/src/lib.rs
+++ b/stm32-metapac-gen/src/lib.rs
@@ -358,6 +358,8 @@ pub fn gen(options: Options) {
                         row.push(core.dma_channels[&channel.channel].channel.to_string());
                         if let Some(request) = channel.request {
                             row.push(request.to_string());
+                        } else {
+                            row.push("()".to_string());
                         }
                         peripheral_dma_channels_table.push(row);
                     }