diff --git a/cmake/QtHeadersClean.cmake b/cmake/QtHeadersClean.cmake
index f47ac1754c7..938b6a7b41f 100644
--- a/cmake/QtHeadersClean.cmake
+++ b/cmake/QtHeadersClean.cmake
@@ -112,6 +112,7 @@ function(qt_internal_add_headersclean_target module_target module_headers)
             -Woverloaded-virtual -Wshadow -Wundef -Wfloat-equal
             -Wnon-virtual-dtor -Wpointer-arith -Wformat-security
             -Wchar-subscripts -Wold-style-cast
+            -Wredundant-decls # QTBUG-115583
             -fno-operator-names)
 
         if(QT_FEATURE_reduce_relocations AND UNIX)