diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h
index 9b557a457f24..387279540139 100644
--- a/arch/arm64/include/asm/mte.h
+++ b/arch/arm64/include/asm/mte.h
@@ -47,8 +47,6 @@ long get_mte_ctrl(struct task_struct *task);
 int mte_ptrace_copy_tags(struct task_struct *child, long request,
 			 unsigned long addr, unsigned long data);
 
-void mte_assign_mem_tag_range(void *addr, size_t size);
-
 #else /* CONFIG_ARM64_MTE */
 
 /* unused if !CONFIG_ARM64_MTE, silence the compiler */
@@ -84,10 +82,6 @@ static inline int mte_ptrace_copy_tags(struct task_struct *child,
 	return -EIO;
 }
 
-static inline void mte_assign_mem_tag_range(void *addr, size_t size)
-{
-}
-
 #endif /* CONFIG_ARM64_MTE */
 
 #endif /* __ASSEMBLY__ */