diff --git a/libs/libfdt/src/lib.rs b/libs/libfdt/src/lib.rs
index ab3c83f..d1ab24e 100644
--- a/libs/libfdt/src/lib.rs
+++ b/libs/libfdt/src/lib.rs
@@ -459,7 +459,7 @@
     }
 
     /// Returns the first subnode of this
-    pub fn first_subnode(&'a mut self) -> Result<Option<Self>> {
+    pub fn first_subnode(self) -> Result<Option<Self>> {
         let offset = self.fdt.first_subnode(self.offset)?;
 
         Ok(offset.map(|offset| Self { fdt: self.fdt, offset }))
diff --git a/libs/libfdt/tests/api_test.rs b/libs/libfdt/tests/api_test.rs
index cafbf97..ddc4538 100644
--- a/libs/libfdt/tests/api_test.rs
+++ b/libs/libfdt/tests/api_test.rs
@@ -378,7 +378,7 @@
     let mut data = fs::read(TEST_TREE_PHANDLE_PATH).unwrap();
     let fdt = Fdt::from_mut_slice(&mut data).unwrap();
 
-    let mut root = fdt.root_mut().unwrap();
+    let root = fdt.root_mut().unwrap();
     let mut subnode_iter = root.first_subnode().unwrap();
 
     while let Some(subnode) = subnode_iter {