diff --git a/rust/nix-c-raw/Cargo.toml b/rust/nix-c-raw/Cargo.toml
index 462a09e..c1bbd01 100644
--- a/rust/nix-c-raw/Cargo.toml
+++ b/rust/nix-c-raw/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 build = "build.rs"
 
 [lib]
+path = "src/lib.rs"
 
 [build-dependencies]
 bindgen = "0.69.4"
diff --git a/rust/nix-expr/Cargo.toml b/rust/nix-expr/Cargo.toml
index 1de81e5..1c68648 100644
--- a/rust/nix-expr/Cargo.toml
+++ b/rust/nix-expr/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
+path = "src/lib.rs"
 
 [dependencies]
 anyhow = "1.0.79"
diff --git a/rust/nix-store/Cargo.toml b/rust/nix-store/Cargo.toml
index 3af19d4..2df0340 100644
--- a/rust/nix-store/Cargo.toml
+++ b/rust/nix-store/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
+path = "src/lib.rs"
 
 [dependencies]
 anyhow = "1.0.79"
diff --git a/rust/nix-util/Cargo.toml b/rust/nix-util/Cargo.toml
index e323aa3..a58cb43 100644
--- a/rust/nix-util/Cargo.toml
+++ b/rust/nix-util/Cargo.toml
@@ -4,6 +4,7 @@ version = "0.1.0"
 edition = "2021"
 
 [lib]
+path = "src/lib.rs"
 
 [dependencies]
 anyhow = "1.0.79"