diff --git a/sys/amd64/linux/linux.h b/sys/amd64/linux/linux.h
--- a/sys/amd64/linux/linux.h
+++ b/sys/amd64/linux/linux.h
@@ -279,6 +279,8 @@
 	    struct linux_pt_regset *l_regset);
 int	linux_ptrace_peekuser(struct thread *td, pid_t pid,
 	    void *addr, void *data);
+int	linux_ptrace_pokeuser(struct thread *td, pid_t pid,
+	    void *addr, void *data);
 #endif /* _KERNEL */
 
 #endif /* !_AMD64_LINUX_H_ */
diff --git a/sys/amd64/linux/linux_machdep.c b/sys/amd64/linux/linux_machdep.c
--- a/sys/amd64/linux/linux_machdep.c
+++ b/sys/amd64/linux/linux_machdep.c
@@ -397,4 +397,12 @@
 	return (copyout(&val, data, sizeof(val)));
 }
 
+int
+linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data)
+{
+
+	LINUX_RATELIMIT_MSG_OPT1("PTRACE_POKEUSER offset %ld "
+	    "not implemented; returning EINVAL", (uintptr_t)addr);
+	return (EINVAL);
+}
 #undef LINUX_URO
diff --git a/sys/amd64/linux32/linux.h b/sys/amd64/linux32/linux.h
--- a/sys/amd64/linux32/linux.h
+++ b/sys/amd64/linux32/linux.h
@@ -433,6 +433,8 @@
 	    struct linux_pt_regset32 *l_regset);
 int	linux_ptrace_peekuser(struct thread *td, pid_t pid,
 	    void *addr, void *data);
+int	linux_ptrace_pokeuser(struct thread *td, pid_t pid,
+	    void *addr, void *data);
 
 extern bool linux32_emulate_i386;
 #endif /* _KERNEL */
diff --git a/sys/amd64/linux32/linux32_machdep.c b/sys/amd64/linux32/linux32_machdep.c
--- a/sys/amd64/linux32/linux32_machdep.c
+++ b/sys/amd64/linux32/linux32_machdep.c
@@ -751,3 +751,12 @@
 	    "returning EINVAL", (uintptr_t)addr);
 	return (EINVAL);
 }
+
+int
+linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data)
+{
+
+	LINUX_RATELIMIT_MSG_OPT1("PTRACE_POKEUSER offset %ld "
+	    "not implemented; returning EINVAL", (uintptr_t)addr);
+	return (EINVAL);
+}
diff --git a/sys/arm64/linux/linux.h b/sys/arm64/linux/linux.h
--- a/sys/arm64/linux/linux.h
+++ b/sys/arm64/linux/linux.h
@@ -206,6 +206,8 @@
 	    struct linux_pt_regset *l_regset);
 int	linux_ptrace_peekuser(struct thread *td, pid_t pid,
 	    void *addr, void *data);
+int	linux_ptrace_pokeuser(struct thread *td, pid_t pid,
+	    void *addr, void *data);
 #endif /* _KERNEL */
 
 #endif /* _ARM64_LINUX_H_ */
diff --git a/sys/arm64/linux/linux_machdep.c b/sys/arm64/linux/linux_machdep.c
--- a/sys/arm64/linux/linux_machdep.c
+++ b/sys/arm64/linux/linux_machdep.c
@@ -160,3 +160,12 @@
 	    "returning EINVAL", (uintptr_t)addr);
 	return (EINVAL);
 }
+
+int
+linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data)
+{
+
+	LINUX_RATELIMIT_MSG_OPT1("PTRACE_POKEUSER offset %ld "
+	    "not implemented; returning EINVAL", (uintptr_t)addr);
+	return (EINVAL);
+}
diff --git a/sys/compat/linux/linux_ptrace.c b/sys/compat/linux/linux_ptrace.c
--- a/sys/compat/linux/linux_ptrace.c
+++ b/sys/compat/linux/linux_ptrace.c
@@ -174,14 +174,6 @@
 	return (error);
 }
 
-static int
-linux_ptrace_pokeuser(struct thread *td, pid_t pid, void *addr, void *data)
-{
-
-	linux_msg(td, "PTRACE_POKEUSER not implemented; returning EINVAL");
-	return (EINVAL);
-}
-
 static int
 linux_ptrace_setoptions(struct thread *td, pid_t pid, l_ulong data)
 {