diff --git a/data/macros.cargo b/data/macros.cargo
index 67372fa..f4fa071 100644
--- a/data/macros.cargo
+++ b/data/macros.cargo
@@ -4,8 +4,8 @@
 
 %cargo_registry %{_usrsrc}/rust
 
-%__cargo_is_lib() %{expand:%__cargo_inspector --target-kinds Cargo.toml | grep -q -F lib}
-%__cargo_is_bin() %{expand:%__cargo_inspector --target-kinds Cargo.toml | grep -q -F bin}
+%__cargo_is_lib() %__cargo_inspector --target-kinds Cargo.toml | grep -q -F "$(printf 'lib\\\nproc-macro')"
+%__cargo_is_bin() %__cargo_inspector --target-kinds Cargo.toml | grep -q -F bin
 
 %cargo_prep (\
 set -eu \
diff --git a/rust2rpm/__main__.py b/rust2rpm/__main__.py
index 0008c31..ced1092 100644
--- a/rust2rpm/__main__.py
+++ b/rust2rpm/__main__.py
@@ -221,7 +221,7 @@ def main():
 
     kwargs = {}
     bins = [tgt for tgt in metadata.targets if tgt.kind == "bin"]
-    libs = [tgt for tgt in metadata.targets if tgt.kind == "lib"]
+    libs = [tgt for tgt in metadata.targets if tgt.kind in ("lib", "proc-macro")]
     is_bin = len(bins) > 0
     is_lib = len(libs) > 0
     if is_bin: