diff --git a/rust-libdeflater.spec b/rust-libdeflater.spec
index c5f7068..a588725 100644
--- a/rust-libdeflater.spec
+++ b/rust-libdeflater.spec
@@ -14,9 +14,6 @@ URL:            https://crates.io/crates/libdeflater
 Source:         %{crates_source}
 
 BuildRequires:  cargo-rpm-macros >= 24
-# Do downstream crate metadata changes programmatically in %%prep. Since %%prep
-# runs before %%generate_buildrequires, we must add the following manually
-# rather than generating a dynamic BuildRequires via rust2rpm.toml.
 BuildRequires:  tomcli
 
 %global _description %{expand:
diff --git a/rust2rpm.toml b/rust2rpm.toml
index 5eee6c1..a03bd66 100644
--- a/rust2rpm.toml
+++ b/rust2rpm.toml
@@ -1,3 +1,8 @@
+[requires]
+build = [
+    "tomcli",
+]
+
 [scripts.prep]
 post = [
     "# Do not depend on criterion; it is needed only for benchmarks.",