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-rw-r--r--src/internal/runtime/maps/table.go2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/internal/runtime/maps/table.go b/src/internal/runtime/maps/table.go
index 60f4263100..232c077db3 100644
--- a/src/internal/runtime/maps/table.go
+++ b/src/internal/runtime/maps/table.go
@@ -571,7 +571,7 @@ func (it *Iter) Next() {
//
// We could avoid most of these lookups if we left a flag
// behind on the old table to denote that it is stale.
- dirIdx := int((uint64(it.dirIdx) + it.dirOffset) % uint64(len(it.m.directory)))
+ dirIdx := int((uint64(it.dirIdx) + it.dirOffset) & uint64(len(it.m.directory)-1))
newTab := it.m.directory[dirIdx]
if it.tab == nil {
if newTab.index != dirIdx {