diff --git a/config/config_test.go b/config/config_test.go
index a2eebd1e..b69bfc0a 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -905,7 +905,7 @@ func TestWithRandomNumber(t *testing.T) {
 		ServiceName: "test-random-number",
 	}
 	randomNum := func() uint64 { return 1 }
-	_, closer, err := cfg.NewTracer(WithRandomNunmber(randomNum))
+	_, closer, err := cfg.NewTracer(WithRandomNumber(randomNum))
 	assert.NoError(t, err)
 	defer closeCloser(t, closer)
 }
diff --git a/config/options.go b/config/options.go
index 7fcd2414..a5065072 100644
--- a/config/options.go
+++ b/config/options.go
@@ -148,8 +148,8 @@ func Extractor(format interface{}, extractor jaeger.Extractor) Option {
 	}
 }
 
-// WithRandomNunmber set the Tracer random number func
-func WithRandomNunmber(f func() uint64) Option {
+// WithRandomNumber set the Tracer random number func
+func WithRandomNumber(f func() uint64) Option {
 	return func(c *Options) {
 		c.randomNumber = f
 	}