diff --git a/arch/arm/core/aarch32/cortex_m/thread_abort.c b/arch/arm/core/aarch32/cortex_m/thread_abort.c
index 7c8ccd18aec..f2f4c8c30db 100644
--- a/arch/arm/core/aarch32/cortex_m/thread_abort.c
+++ b/arch/arm/core/aarch32/cortex_m/thread_abort.c
@@ -24,8 +24,6 @@
 #include <wait_q.h>
 #include <sys/__assert.h>
 
-extern void z_thread_single_abort(struct k_thread *thread);
-
 void z_impl_k_thread_abort(k_tid_t thread)
 {
 	z_thread_single_abort(thread);
diff --git a/arch/posix/core/posix_core.c b/arch/posix/core/posix_core.c
index dfb71b59df8..81da069a542 100644
--- a/arch/posix/core/posix_core.c
+++ b/arch/posix/core/posix_core.c
@@ -477,9 +477,6 @@ void posix_abort_thread(int thread_idx)
 
 
 #if defined(CONFIG_ARCH_HAS_THREAD_ABORT)
-
-extern void z_thread_single_abort(struct k_thread *thread);
-
 void z_impl_k_thread_abort(k_tid_t thread)
 {
 	unsigned int key;
diff --git a/kernel/include/ksched.h b/kernel/include/ksched.h
index e75ad4eff06..9b2b751fda4 100644
--- a/kernel/include/ksched.h
+++ b/kernel/include/ksched.h
@@ -63,6 +63,7 @@ void z_sched_abort(struct k_thread *thread);
 void z_sched_ipi(void);
 void z_sched_start(struct k_thread *thread);
 void z_ready_thread(struct k_thread *thread);
+void z_thread_single_abort(struct k_thread *thread);
 
 static inline void z_pend_curr_unlocked(_wait_q_t *wait_q, k_timeout_t timeout)
 {
diff --git a/kernel/thread_abort.c b/kernel/thread_abort.c
index 561f0bee5f6..3b77c79ae28 100644
--- a/kernel/thread_abort.c
+++ b/kernel/thread_abort.c
@@ -22,8 +22,6 @@
 #include <sys/__assert.h>
 #include <syscall_handler.h>
 
-extern void z_thread_single_abort(struct k_thread *thread);
-
 #if !defined(CONFIG_ARCH_HAS_THREAD_ABORT)
 void z_impl_k_thread_abort(k_tid_t thread)
 {