diff --git a/pyo3-ffi-check/Cargo.toml b/pyo3-ffi-check/Cargo.toml
index 874da3d2bef..cdf38c9f9bf 100644
--- a/pyo3-ffi-check/Cargo.toml
+++ b/pyo3-ffi-check/Cargo.toml
@@ -6,7 +6,6 @@ publish = false
 
 [dependencies]
 pyo3-ffi-check-macro = { path = "./macro" }
-memoffset = "0.9.0"
 
 [dependencies.pyo3-ffi]
 path = "../pyo3-ffi"
diff --git a/pyo3-ffi-check/src/main.rs b/pyo3-ffi-check/src/main.rs
index 0407a2ffa39..3e887475d21 100644
--- a/pyo3-ffi-check/src/main.rs
+++ b/pyo3-ffi-check/src/main.rs
@@ -50,9 +50,9 @@ fn main() {
         ($struct_name:ident, $field:ident, $bindgen_field:ident) => {{
             // some struct fields are deprecated but still present in the ABI
             #[allow(clippy::used_underscore_binding, deprecated)]
-            let pyo3_ffi_offset = memoffset::offset_of!(pyo3_ffi::$struct_name, $field);
+            let pyo3_ffi_offset = std::mem::offset_of!(pyo3_ffi::$struct_name, $field);
             #[allow(clippy::used_underscore_binding)]
-            let bindgen_offset = memoffset::offset_of!(bindings::$struct_name, $bindgen_field);
+            let bindgen_offset = std::mem::offset_of!(bindings::$struct_name, $bindgen_field);
 
             if pyo3_ffi_offset != bindgen_offset {
                 failed = true;