diff --git a/nixide-sys/tests/eval.rs b/nixide-sys/tests/eval.rs
index 742b4d0..c417850 100644
--- a/nixide-sys/tests/eval.rs
+++ b/nixide-sys/tests/eval.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "nix-expr-c")]
 #![cfg(test)]
 
 use std::{
diff --git a/nixide-sys/tests/flake.rs b/nixide-sys/tests/flake.rs
index 01fed21..d9f67c8 100644
--- a/nixide-sys/tests/flake.rs
+++ b/nixide-sys/tests/flake.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "nix-flake-c")]
 #![cfg(test)]
 
 use std::ptr;
diff --git a/nixide-sys/tests/memory.rs b/nixide-sys/tests/memory.rs
index 229b6bd..4ac8702 100644
--- a/nixide-sys/tests/memory.rs
+++ b/nixide-sys/tests/memory.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "nix-expr-c")]
 #![cfg(test)]
 
 use std::ffi::CString;
diff --git a/nixide-sys/tests/primop.rs b/nixide-sys/tests/primop.rs
index ecfacf8..257faaf 100644
--- a/nixide-sys/tests/primop.rs
+++ b/nixide-sys/tests/primop.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "nix-expr-c")]
 #![cfg(test)]
 
 use std::{
diff --git a/nixide-sys/tests/store.rs b/nixide-sys/tests/store.rs
index bb12a33..b1c8171 100644
--- a/nixide-sys/tests/store.rs
+++ b/nixide-sys/tests/store.rs
@@ -1,3 +1,4 @@
+#![cfg(feature = "nix-store-c")]
 #![cfg(test)]
 
 use std::{ffi::CString, ptr};