diff --git a/taglib/toolkit/tbytevectorstream.cpp b/taglib/toolkit/tbytevectorstream.cpp
index 12e28ac2..11def596 100644
--- a/taglib/toolkit/tbytevectorstream.cpp
+++ b/taglib/toolkit/tbytevectorstream.cpp
@@ -37,17 +37,15 @@ using namespace TagLib;
 class ByteVectorStream::ByteVectorStreamPrivate
 {
 public:
-  ByteVectorStreamPrivate(const ByteVector &data);
+  ByteVectorStreamPrivate(const ByteVector &data) :
+    data(data)
+  {
+  }
 
   ByteVector data;
   offset_t position { 0 };
 };
 
-ByteVectorStream::ByteVectorStreamPrivate::ByteVectorStreamPrivate(const ByteVector &data) :
-  data(data)
-{
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // public members
 ////////////////////////////////////////////////////////////////////////////////