diff --git a/assert.go b/assert.go
index 7d5f90e..1a3166b 100644
--- a/assert.go
+++ b/assert.go
@@ -3,14 +3,13 @@ package assert
 import (
 	"reflect"
 	"runtime"
-	"testing"
 )
 
 // Assert is a helper for tests
 type Assert func(bool, ...interface{})
 
 // New returns a new Assert
-func New(t *testing.T) Assert {
+func New(t T) Assert {
 	a := func(ok bool, msg ...interface{}) {
 		if !ok {
 			if msg == nil {
diff --git a/helper.go b/helper.go
index 67cc4a9..e94190b 100644
--- a/helper.go
+++ b/helper.go
@@ -5,7 +5,6 @@ import (
 	"reflect"
 	"runtime"
 	"strconv"
-	"testing"
 )
 
 func prepMsg(msg []interface{}, format string, args ...interface{}) []interface{} {
@@ -16,9 +15,9 @@ func shell(i int) string {
 	return "\x1B[" + strconv.Itoa(i) + "m"
 }
 
-var ts = map[*runtime.Func]*testing.T{}
+var ts = map[*runtime.Func]T{}
 
-func t(a Assert) *testing.T {
+func t(a Assert) T {
 	f := runtime.FuncForPC(reflect.ValueOf(a).Pointer())
 	return ts[f]
 }
diff --git a/type.go b/type.go
new file mode 100644
index 0000000..1c9a1fd
--- /dev/null
+++ b/type.go
@@ -0,0 +1,7 @@
+package assert
+
+// T is an interface of what we use from testing.T
+type T interface {
+	Error(...interface{})
+	Helper()
+}