diff --git a/nixide/src/expr/values/attrs.rs b/nixide/src/expr/values/attrs.rs
index e0ab6a0..9f8f8e4 100644
--- a/nixide/src/expr/values/attrs.rs
+++ b/nixide/src/expr/values/attrs.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::{self, NonNull};
 
@@ -21,7 +20,7 @@ impl Clone for NixAttrs {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/bool.rs b/nixide/src/expr/values/bool.rs
index e400bf0..dd04031 100644
--- a/nixide/src/expr/values/bool.rs
+++ b/nixide/src/expr/values/bool.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -20,7 +19,7 @@ impl Clone for NixBool {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/float.rs b/nixide/src/expr/values/float.rs
index 59c52ab..9538b45 100644
--- a/nixide/src/expr/values/float.rs
+++ b/nixide/src/expr/values/float.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -20,7 +19,7 @@ impl Clone for NixFloat {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/function.rs b/nixide/src/expr/values/function.rs
index 4cc08d7..83d7d2a 100644
--- a/nixide/src/expr/values/function.rs
+++ b/nixide/src/expr/values/function.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -19,7 +18,7 @@ impl Clone for NixFunction {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/int.rs b/nixide/src/expr/values/int.rs
index e783e3c..86e5e94 100644
--- a/nixide/src/expr/values/int.rs
+++ b/nixide/src/expr/values/int.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -20,7 +19,7 @@ impl Clone for NixInt {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/list.rs b/nixide/src/expr/values/list.rs
index 001e971..4c0f354 100644
--- a/nixide/src/expr/values/list.rs
+++ b/nixide/src/expr/values/list.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -19,7 +18,7 @@ impl Clone for NixList {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/null.rs b/nixide/src/expr/values/null.rs
index 7ac8ecc..fd20445 100644
--- a/nixide/src/expr/values/null.rs
+++ b/nixide/src/expr/values/null.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -19,7 +18,7 @@ impl Clone for NixNull {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/path.rs b/nixide/src/expr/values/path.rs
index 066808e..6d51fd6 100644
--- a/nixide/src/expr/values/path.rs
+++ b/nixide/src/expr/values/path.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::path::PathBuf;
 use std::ptr::NonNull;
@@ -22,7 +21,7 @@ impl Clone for NixPath {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/string.rs b/nixide/src/expr/values/string.rs
index 658599b..765d763 100644
--- a/nixide/src/expr/values/string.rs
+++ b/nixide/src/expr/values/string.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -20,7 +19,7 @@ impl Clone for NixString {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();
 
diff --git a/nixide/src/expr/values/thunk.rs b/nixide/src/expr/values/thunk.rs
index bc20cc8..b6439ce 100644
--- a/nixide/src/expr/values/thunk.rs
+++ b/nixide/src/expr/values/thunk.rs
@@ -1,4 +1,3 @@
-use std::ffi::c_void;
 use std::fmt::{Debug, Display, Formatter, Result as FmtResult};
 use std::ptr::NonNull;
 
@@ -19,7 +18,7 @@ impl Clone for NixThunk {
         let inner = self.inner.clone();
 
         wrap::nix_fn!(|ctx: &ErrorContext| unsafe {
-            sys::nix_gc_incref(ctx.as_ptr(), self.as_ptr() as *mut c_void);
+            sys::nix_value_incref(ctx.as_ptr(), self.as_ptr());
         })
         .unwrap();