diff --git a/multierror/multierror_go119.go b/internal/multierror/multierror_go119.go
similarity index 100%
rename from multierror/multierror_go119.go
rename to internal/multierror/multierror_go119.go
diff --git a/multierror/multierror_go120.go b/internal/multierror/multierror_go120.go
similarity index 100%
rename from multierror/multierror_go120.go
rename to internal/multierror/multierror_go120.go
diff --git a/iter/map.go b/iter/map.go
index 36801ff..efbe6bf 100644
--- a/iter/map.go
+++ b/iter/map.go
@@ -3,7 +3,7 @@ package iter
 import (
 	"sync"
 
-	"github.com/sourcegraph/conc/multierror"
+	"github.com/sourcegraph/conc/internal/multierror"
 )
 
 // Mapper is an Iterator with a result type R. It can be used to configure
diff --git a/pool/error_pool.go b/pool/error_pool.go
index 5d584f3..6e5aa99 100644
--- a/pool/error_pool.go
+++ b/pool/error_pool.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"sync"
 
-	"github.com/sourcegraph/conc/multierror"
+	"github.com/sourcegraph/conc/internal/multierror"
 )
 
 // ErrorPool is a pool that runs tasks that may return an error.