diff --git a/rust/kernel/usb.rs b/rust/kernel/usb.rs
index bbf85366d2c9..6dfdd64dd617 100644
--- a/rust/kernel/usb.rs
+++ b/rust/kernel/usb.rs
@@ -382,6 +382,7 @@ fn as_ref(&self) -> &Device {
 
 // SAFETY: Instances of `Interface` are always reference-counted.
 unsafe impl AlwaysRefCounted for Interface {
+    #[inline]
     fn inc_ref(&self) {
         // SAFETY: The invariants of `Interface` guarantee that `self.as_raw()`
         // returns a valid `struct usb_interface` pointer, for which we will
@@ -389,6 +390,7 @@ fn inc_ref(&self) {
         unsafe { bindings::usb_get_intf(self.as_raw()) };
     }
 
+    #[inline]
     unsafe fn dec_ref(obj: NonNull<Self>) {
         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
         unsafe { bindings::usb_put_intf(obj.cast().as_ptr()) }
@@ -433,6 +435,7 @@ fn as_raw(&self) -> *mut bindings::usb_device {
 
 // SAFETY: Instances of `Device` are always reference-counted.
 unsafe impl AlwaysRefCounted for Device {
+    #[inline]
     fn inc_ref(&self) {
         // SAFETY: The invariants of `Device` guarantee that `self.as_raw()`
         // returns a valid `struct usb_device` pointer, for which we will
@@ -440,6 +443,7 @@ fn inc_ref(&self) {
         unsafe { bindings::usb_get_dev(self.as_raw()) };
     }
 
+    #[inline]
     unsafe fn dec_ref(obj: NonNull<Self>) {
         // SAFETY: The safety requirements guarantee that the refcount is non-zero.
         unsafe { bindings::usb_put_dev(obj.cast().as_ptr()) }