diff --git a/tests/src/tagreader_test.cpp b/tests/src/tagreader_test.cpp
index 0de68458..a3e46084 100644
--- a/tests/src/tagreader_test.cpp
+++ b/tests/src/tagreader_test.cpp
@@ -86,7 +86,7 @@ class TagReaderTest : public ::testing::Test {
         qint64 bytes_read = qMin(file.bytesAvailable(), 8192LL);
         buffer = file.read(bytes_read);
         if (buffer.isEmpty()) break;
-        hash.addData(buffer, bytes_read);
+        hash.addData(buffer);
       }
       file.close();
       return hash.result().toHex();