diff --git a/src/runtime/sys_linux_amd64.s b/src/runtime/sys_linux_amd64.s
index 3a0c47f..fa7fa16 100644
--- a/src/runtime/sys_linux_amd64.s
+++ b/src/runtime/sys_linux_amd64.s
@@ -350,7 +350,7 @@
 	// Call fn
 	CALL	R12
 
-	// It shouldn't return.  If it does, exit
+	// It shouldn't return.  If it does, exit that thread.
 	MOVL	$111, DI
 	MOVL	$60, AX
 	SYSCALL
diff --git a/src/runtime/sys_linux_arm.s b/src/runtime/sys_linux_arm.s
index 9d21eae..d0c6d22 100644
--- a/src/runtime/sys_linux_arm.s
+++ b/src/runtime/sys_linux_arm.s
@@ -307,7 +307,7 @@
 	MOVW	$16(R13), R13
 	BL	(R0)
 
-	// It shouldn't return
+	// It shouldn't return.  If it does, exit that thread.
 	MOVW	$0, R0
 	MOVW	R0, 4(R13)
 	BL	runtime·exit1(SB)
diff --git a/src/runtime/sys_linux_arm64.s b/src/runtime/sys_linux_arm64.s
index ea8520c..389fea0 100644
--- a/src/runtime/sys_linux_arm64.s
+++ b/src/runtime/sys_linux_arm64.s
@@ -361,10 +361,10 @@
 	MOVD	R12, R0
 	BL	(R0)
 
-	// It shouldn't return.	 If it does, exit
+	// It shouldn't return.	 If it does, exit that thread.
 	MOVW	$111, R0
 again:
-	MOVD	$SYS_exit_group, R8
+	MOVD	$SYS_exit, R8
 	SVC
 	B	again	// keep exiting
 
diff --git a/src/runtime/sys_linux_ppc64x.s b/src/runtime/sys_linux_ppc64x.s
index ff397f0..44a22c9 100644
--- a/src/runtime/sys_linux_ppc64x.s
+++ b/src/runtime/sys_linux_ppc64x.s
@@ -346,9 +346,9 @@
 	MOVD	R12, CTR
 	BL	(CTR)
 
-	// It shouldn't return.  If it does, exit
+	// It shouldn't return.	 If it does, exit that thread.
 	MOVW	$111, R3
-	SYSCALL $SYS_exit_group
+	SYSCALL	$SYS_exit
 	BR	-2(PC)	// keep exiting
 
 TEXT runtime·sigaltstack(SB),NOSPLIT,$-8