diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index 72060bac34..71520a6344 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,5 +1,8 @@
 2013-03-13  Roland McGrath  <roland@hack.frob.com>
 
+	* sysdeps/arm/add_n.S: Include <arm-features.h>.
+	[ARM_ALWAYS_BX]: Don't pop into pc.
+
 	* sysdeps/arm/arm-features.h: Add comment about ARM_ALWAYS_BX.
 	* sysdeps/arm/memcpy.S: Include <arm-features.h>.
 	[ARM_ALWAYS_BX]: Avoid pc as destination.
diff --git a/ports/sysdeps/arm/add_n.S b/ports/sysdeps/arm/add_n.S
index 119a9942d1..52927d997d 100644
--- a/ports/sysdeps/arm/add_n.S
+++ b/ports/sysdeps/arm/add_n.S
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <sysdep.h>
+#include <arm-features.h>
 
 	.syntax unified
 	.text
@@ -80,5 +81,10 @@ ENTRY (FUNC)
 
 9:
 	RETC				/* copy carry out */
+#ifndef ARM_ALWAYS_BX
 	pop	{ r4, r5, r6, r7, r8, r10, pc }
+#else
+	pop	{ r4, r5, r6, r7, r8, r10, lr }
+	bx	lr
+#endif
 END (FUNC)