diff --git a/taglib/mpeg/mpegfile.cpp b/taglib/mpeg/mpegfile.cpp
index aec87821..33949931 100644
--- a/taglib/mpeg/mpegfile.cpp
+++ b/taglib/mpeg/mpegfile.cpp
@@ -473,7 +473,7 @@ long MPEG::File::nextFrameOffset(long position)
     seek(position);
     buffer = readBlock(bufferSize());
 
-    for(uint i = 0; i < buffer.size() - 1; i++) {
+    for(int i = 0; i < int(buffer.size()) - 1; i++) {
       if(uchar(buffer[i]) == 0xff && secondSynchByte(buffer[i + 1]))
         return position + i;
     }