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-rw-r--r--sys/lib/libkern/arch/amd64/memset.S1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/lib/libkern/arch/amd64/memset.S b/sys/lib/libkern/arch/amd64/memset.S
index 0f6ae1064d0..670d9426b13 100644
--- a/sys/lib/libkern/arch/amd64/memset.S
+++ b/sys/lib/libkern/arch/amd64/memset.S
@@ -8,6 +8,7 @@
ENTRY(memset)
movq %rsi,%rax
+ andq $0xff,%rax
movq %rdx,%rcx
movq %rdi,%r11