diff --git a/libc/arch-arm/bionic/clone.S b/libc/arch-arm/bionic/clone.S
index 13bc7d7..281230c 100644
--- a/libc/arch-arm/bionic/clone.S
+++ b/libc/arch-arm/bionic/clone.S
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <linux/err.h>
 #include <machine/asm.h>
 #include <sys/linux-syscalls.h>
 
@@ -45,10 +46,12 @@
     movs    r0, r0
     beq     1f
 
-    # In parent, reload saved registers then either exit or set errno.
+    # In parent, reload saved registers then either return or set errno.
     ldmfd   sp!, {r4, r7}
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 
 1:  # The child.
     # pick the function arg and call address off the stack and jump
@@ -94,10 +97,12 @@
     movs    r0, r0
     beq     1f
 
-    # In the parent, reload saved registers then either exit or set errno.
+    # In the parent, reload saved registers then either return or set errno.
     ldmfd   sp!, {r4, r5, r6, r7}
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 
 1:  # The child.
     ldr    r0, [sp, #-4]
diff --git a/libc/arch-arm/bionic/kill.S b/libc/arch-arm/bionic/kill.S
index 33dfc2b..7e030f3 100644
--- a/libc/arch-arm/bionic/kill.S
+++ b/libc/arch-arm/bionic/kill.S
@@ -32,6 +32,8 @@
    abort due to a fatal runtime error (e.g. detection
    of a corrupted malloc heap).
 */
+
+#include <linux/err.h>
 #include <sys/linux-syscalls.h>
 #include <machine/asm.h>
 
@@ -44,7 +46,8 @@
     ldr     r7, =__NR_kill
     swi     #0
     ldmfd   sp!, {r4-r7, ip, lr}
-    movs    r0, r0
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 END(kill)
diff --git a/libc/arch-arm/bionic/syscall.S b/libc/arch-arm/bionic/syscall.S
index 69f3bec..be9591e 100644
--- a/libc/arch-arm/bionic/syscall.S
+++ b/libc/arch-arm/bionic/syscall.S
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <linux/err.h>
 #include <machine/asm.h>
 #include <sys/linux-syscalls.h>
 
@@ -39,7 +40,8 @@
     ldmfd   ip, {r3, r4, r5, r6}
     swi     #0
     ldmfd   sp!, {r4, r5, r6, r7}
-    movs    r0, r0
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 END(syscall)
diff --git a/libc/arch-arm/bionic/tgkill.S b/libc/arch-arm/bionic/tgkill.S
index da5c0af..60df9e6 100644
--- a/libc/arch-arm/bionic/tgkill.S
+++ b/libc/arch-arm/bionic/tgkill.S
@@ -33,6 +33,7 @@
    of a corrupted malloc heap).
 */
 
+#include <linux/err.h>
 #include <sys/linux-syscalls.h>
 #include <machine/asm.h>
 
@@ -45,7 +46,8 @@
     ldr     r7, =__NR_tgkill
     swi     #0
     ldmfd   sp!, {r4-r7, ip, lr}
-    movs    r0, r0
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 END(tgkill)
diff --git a/libc/arch-arm/bionic/tkill.S b/libc/arch-arm/bionic/tkill.S
index fdc5ed4..d5bb739 100644
--- a/libc/arch-arm/bionic/tkill.S
+++ b/libc/arch-arm/bionic/tkill.S
@@ -33,6 +33,7 @@
    of a corrupted malloc heap).
 */
 
+#include <linux/err.h>
 #include <sys/linux-syscalls.h>
 #include <machine/asm.h>
 
@@ -45,7 +46,8 @@
     ldr     r7, =__NR_tkill
     swi     #0
     ldmfd   sp!, {r4-r7, ip, lr}
-    movs    r0, r0
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 END(tkill)