diff --git a/src/core/tools/qbytearray.cpp b/src/core/tools/qbytearray.cpp
index 9b58e57ed..fca1008f7 100644
--- a/src/core/tools/qbytearray.cpp
+++ b/src/core/tools/qbytearray.cpp
@@ -1954,7 +1954,7 @@ QByteArray &QByteArray::replace(const char *c, const QByteArray &after)
 
 QByteArray &QByteArray::replace(const char *before, int bsize, const char *after, int asize)
 {
-    if (isNull() || (before == after && bsize == asize))
+    if (isEmpty() || (before == after && bsize == asize))
         return *this;
 
     QByteArrayMatcher matcher(before, bsize);