diff --git a/taglib/it/itfile.cpp b/taglib/it/itfile.cpp
index f87ea9ae..b1349a04 100644
--- a/taglib/it/itfile.cpp
+++ b/taglib/it/itfile.cpp
@@ -315,7 +315,7 @@ void IT::File::read(bool)
     comment.append(sampleName);
   }
 
-  if(message.size() > 0)
+  if(!message.isEmpty())
     comment.append(message);
   d->tag.setComment(comment.toString("\n"));
   d->tag.setTrackerName("Impulse Tracker");
diff --git a/taglib/mpeg/id3v2/id3v2synchdata.cpp b/taglib/mpeg/id3v2/id3v2synchdata.cpp
index f538baf6..7ba353ee 100644
--- a/taglib/mpeg/id3v2/id3v2synchdata.cpp
+++ b/taglib/mpeg/id3v2/id3v2synchdata.cpp
@@ -74,7 +74,7 @@ ByteVector SynchData::fromUInt(unsigned int value)
 
 ByteVector SynchData::decode(const ByteVector &data)
 {
-  if (data.size() == 0) {
+  if(data.isEmpty()) {
     return ByteVector();
   }
 
diff --git a/taglib/toolkit/tbytevector.cpp b/taglib/toolkit/tbytevector.cpp
index bfacabd9..fb486bd8 100644
--- a/taglib/toolkit/tbytevector.cpp
+++ b/taglib/toolkit/tbytevector.cpp
@@ -376,12 +376,12 @@ ByteVector &ByteVector::setData(const char *data)
 char *ByteVector::data()
 {
   detach();
-  return (size() > 0) ? (&(*d->data)[d->offset]) : nullptr;
+  return !isEmpty() ? (&(*d->data)[d->offset]) : nullptr;
 }
 
 const char *ByteVector::data() const
 {
-  return (size() > 0) ? (&(*d->data)[d->offset]) : nullptr;
+  return !isEmpty() ? (&(*d->data)[d->offset]) : nullptr;
 }
 
 ByteVector ByteVector::mid(unsigned int index, unsigned int length) const
diff --git a/taglib/xm/xmfile.cpp b/taglib/xm/xmfile.cpp
index ac357682..1dfbe1f9 100644
--- a/taglib/xm/xmfile.cpp
+++ b/taglib/xm/xmfile.cpp
@@ -159,7 +159,7 @@ public:
   unsigned int read(TagLib::File &file, unsigned int limit) override
   {
     ByteVector data = file.readBlock(std::min(1U,limit));
-    if(data.size() > 0) {
+    if(!data.isEmpty()) {
       value = data[0];
     }
     return data.size();