diff --git a/sys/powerpc/powerpc/swtch64.S b/sys/powerpc/powerpc/swtch64.S
index 0b22c4edb41..fd4806d5bf5 100644
--- a/sys/powerpc/powerpc/swtch64.S
+++ b/sys/powerpc/powerpc/swtch64.S
@@ -279,6 +279,7 @@ ENTRY(savectx)
 	mfcr	%r4			/* Save the condition register */
 	std	%r4,PCB_CR(%r3)
 	std	%r2,PCB_TOC(%r3)	/* Save the TOC pointer */
+	std	%r1,PCB_SP(%r3)		/* Save the stack frame pointer */
 	mflr	%r4			/* Save the link register */
 	std	%r4,PCB_LR(%r3)
 	blr