diff --git a/cmd/mtwebmapper/misc.go b/cmd/mtwebmapper/misc.go
index 88e8fdf..1391547 100644
--- a/cmd/mtwebmapper/misc.go
+++ b/cmd/mtwebmapper/misc.go
@@ -27,10 +27,3 @@ func ipsFromHosts(hosts string) ([]net.IP, error) {
 
 	return ips, nil
 }
-
-func min(a, b int) int {
-	if a < b {
-		return a
-	}
-	return b
-}
diff --git a/cmd/mtwebmapper/tilesupdater.go b/cmd/mtwebmapper/tilesupdater.go
index 0a7aad2..725fa29 100644
--- a/cmd/mtwebmapper/tilesupdater.go
+++ b/cmd/mtwebmapper/tilesupdater.go
@@ -159,7 +159,7 @@ func (tu *tileUpdater) doUpdates() {
 		jobs := make(chan xz)
 		var done sync.WaitGroup
 
-		for i, n := 0, min(tu.workers, len(changes)); i < n; i++ {
+		for i, n := 0, common.Min(tu.workers, len(changes)); i < n; i++ {
 			var client *common.RedisClient
 			var err error
 			if client, err = common.NewRedisClient("tcp", tu.redisAddress); err != nil {
@@ -184,7 +184,7 @@ func (tu *tileUpdater) doUpdates() {
 
 		for level := 7; level >= 0; level-- {
 			pJobs := make(chan xzm)
-			for i, n := 0, min(len(parentJobs), tu.workers); i < n; i++ {
+			for i, n := 0, common.Min(len(parentJobs), tu.workers); i < n; i++ {
 				done.Add(1)
 				go updatePyramidTiles(level, tu.mapDir, pJobs, &done)
 			}
diff --git a/common/math.go b/common/math.go
index f15e126..44c3e1f 100644
--- a/common/math.go
+++ b/common/math.go
@@ -1,12 +1,19 @@
 package common
 
-func max(a, b int) int {
+func Max(a, b int) int {
 	if a > b {
 		return a
 	}
 	return b
 }
 
+func Min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
 func max32(a, b int32) int32 {
 	if a > b {
 		return a
diff --git a/common/renderer.go b/common/renderer.go
index 778de37..526e4ac 100644
--- a/common/renderer.go
+++ b/common/renderer.go
@@ -51,7 +51,7 @@ func (yo *YOrder) Reset() {
 
 func copyData(data []byte) []byte {
 	l := len(data)
-	ndata := make([]byte, l, max(l, 8*1024))
+	ndata := make([]byte, l, Max(l, 8*1024))
 	copy(ndata, data)
 	return ndata
 }
@@ -70,7 +70,7 @@ func (yo *YOrder) RenderBlock(block *Block, colors *Colors) (err error) {
 		err = yo.Renderer.RenderBlock(oblock, colors)
 		l := len(block.Data)
 		if cap(oblock.Data) < l {
-			oblock.Data = make([]byte, l, max(l, 8*1024))
+			oblock.Data = make([]byte, l, Max(l, 8*1024))
 		} else {
 			oblock.Data = oblock.Data[0:l]
 		}