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-rw-r--r--sys/src/libmach/6.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/src/libmach/6.c b/sys/src/libmach/6.c
index a4d7d2e67..8b6c8a169 100644
--- a/sys/src/libmach/6.c
+++ b/sys/src/libmach/6.c
@@ -111,7 +111,7 @@ Mach mamd64=
0x00007ffffffff000ull, /* user stack top */
1, /* quantization of pc */
8, /* szaddr */
- 4, /* szreg */
+ 8, /* szreg */
4, /* szfloat */
8, /* szdouble */
};