diff --git a/bytes_test.go b/bytes_test.go
index fd4f478..e6449a9 100644
--- a/bytes_test.go
+++ b/bytes_test.go
@@ -28,7 +28,7 @@ func TestBytesBufferPool_Get(t *testing.T) {
 	assert.Equal(t, 0, b.Cap())
 
 	const str = "dit is een hele lang test string met heel veel willekeurige woorden die nergens op slaan zolang de buffer maar groeit"
-	b.WriteString(str)
+	_, _ = b.WriteString(str)
 	assert.Equal(t, str, b.String())
 
 	p.Put(b)
diff --git a/string_test.go b/string_test.go
index 505af5b..368c3c9 100644
--- a/string_test.go
+++ b/string_test.go
@@ -19,7 +19,7 @@ func TestToStringWriter(t *testing.T) {
 		var writer writerOnly
 		sw := ToStringWriter(&writer)
 		assert.NotSame(t, &writer, sw)
-		sw.WriteString("test")
+		_, _ = sw.WriteString("test")
 		assert.Equal(t, "test", string(writer.buf))
 	})
 }