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-rw-r--r--sys/src/libmp/port/mptov.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/src/libmp/port/mptov.c b/sys/src/libmp/port/mptov.c
index 2c76dc6c0..7089bbd7d 100644
--- a/sys/src/libmp/port/mptov.c
+++ b/sys/src/libmp/port/mptov.c
@@ -47,7 +47,7 @@ mptov(mpint *b)
v = 0ULL;
for(s = 0; s < b->top; s++)
- v |= b->p[s]<<(s*sizeof(mpdigit)*8);
+ v |= (uvlong)b->p[s]<<(s*sizeof(mpdigit)*8);
if(b->sign > 0){
if(v > MAXVLONG)