diff --git a/enterprise/b/btree.go b/enterprise/b/btree.go
index 7b9b34e76..c61f5c5b6 100644
--- a/enterprise/b/btree.go
+++ b/enterprise/b/btree.go
@@ -75,7 +75,7 @@ type (
 	//	  0 if a == b
 	//	> 0 if a >  b
 	//
-	Cmp func(a, b uint64) int
+	Cmp func(a, b uint64) int64
 
 	d struct { // data page
 		c int
diff --git a/enterprise/b/containers_btree.go b/enterprise/b/containers_btree.go
index 7487eea70..c2f95c0c7 100644
--- a/enterprise/b/containers_btree.go
+++ b/enterprise/b/containers_btree.go
@@ -23,8 +23,8 @@ import (
 	"github.com/pilosa/pilosa/roaring"
 )
 
-func cmp(a, b uint64) int {
-	return int(a - b)
+func cmp(a, b uint64) int64 {
+	return int64(a - b)
 }
 
 type bTreeContainers struct {