diff --git a/src/corelib/io/qurl.cpp b/src/corelib/io/qurl.cpp
index a3ff86b3538..d9137f439d3 100644
--- a/src/corelib/io/qurl.cpp
+++ b/src/corelib/io/qurl.cpp
@@ -405,9 +405,6 @@ QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
 
-// in qstring.cpp:
-void qt_from_latin1(char16_t *dst, const char *str, size_t size) noexcept;
-
 inline static bool isHex(char c)
 {
     c |= 0x20;