diff --git a/src/clang-sys/debian/debcargo.toml b/src/clang-sys/debian/debcargo.toml
index c7b4df6..9ccbef8 100644
--- a/src/clang-sys/debian/debcargo.toml
+++ b/src/clang-sys/debian/debcargo.toml
@@ -5,5 +5,9 @@
 ]
 excludes = ["ci/**"]
 
+[source]
+build_depends = ["llvm", "clang"]
+
 [packages.lib]
 depends = ["libclang-dev"]
+recommends = ["llvm", "clang"]