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-rw-r--r--sys/src/libmp/port/mptouv.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/src/libmp/port/mptouv.c b/sys/src/libmp/port/mptouv.c
index 760b38fb5..e657ebcbb 100644
--- a/sys/src/libmp/port/mptouv.c
+++ b/sys/src/libmp/port/mptouv.c
@@ -33,11 +33,11 @@ mptouv(mpint *b)
uvlong v;
int s;
- if(b->top == 0)
+ if(b->top == 0 || b->sign < 0)
return 0LL;
if(b->top > VLDIGITS)
- return MAXVLONG;
+ return -1LL;
v = 0ULL;
for(s = 0; s < b->top; s++)