diff --git a/src/corelib/thread/qmutex.cpp b/src/corelib/thread/qmutex.cpp
index 9bfd50f2d91..7f052feaa50 100644
--- a/src/corelib/thread/qmutex.cpp
+++ b/src/corelib/thread/qmutex.cpp
@@ -349,19 +349,6 @@ void QMutex::unlock() noexcept
         unlockInternal();
 }
 
-
-/*!
-    \fn bool QMutex::isRecursive() const
-    \since 5.7
-
-    Returns \c true if the mutex is recursive.
-*/
-
-bool QBasicMutex::isRecursive() noexcept
-{
-    return QT_PREPEND_NAMESPACE(isRecursive)(d_ptr.loadAcquire());
-}
-
 /*!
     \since 5.7
 
diff --git a/src/corelib/thread/qmutex.h b/src/corelib/thread/qmutex.h
index 8ac6088c129..c1c87100e69 100644
--- a/src/corelib/thread/qmutex.h
+++ b/src/corelib/thread/qmutex.h
@@ -94,8 +94,6 @@ public:
 
     // Lockable concept
     bool try_lock() noexcept { return tryLock(); }
-
-    bool isRecursive() noexcept; //### Qt6: remove me
     bool isRecursive() const noexcept;
 
 private: