diff --git a/internal/datagen/generator.go b/internal/datagen/generator.go
index e30841e..ff8a85b 100644
--- a/internal/datagen/generator.go
+++ b/internal/datagen/generator.go
@@ -22,6 +22,7 @@ type (
 	Generator struct {
 		vu     modules.VU
 		size   int
+		rand   *rand.Rand
 		buf    []byte
 		offset int
 	}
@@ -35,10 +36,6 @@ type (
 // TailSize specifies number of extra random bytes in the buffer tail.
 const TailSize = 1024
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 func NewGenerator(vu modules.VU, size int) Generator {
 	if size <= 0 {
 		panic("size should be positive")
@@ -46,6 +43,7 @@ func NewGenerator(vu modules.VU, size int) Generator {
 	return Generator{
 		vu:   vu,
 		size: size,
+		rand: rand.New(rand.NewSource(time.Now().UnixNano())),
 		buf:  make([]byte, size+TailSize),
 	}
 }
@@ -66,7 +64,7 @@ func (g *Generator) GenPayload(calcHash bool) GenPayloadResponse {
 func (g *Generator) nextSlice() []byte {
 	if g.offset >= TailSize {
 		g.offset = 0
-		rand.Read(g.buf) // Per docs, err is always nil here
+		g.rand.Read(g.buf) // Per docs, err is always nil here
 	}
 
 	result := g.buf[g.offset : g.offset+g.size]