diff --git a/src/corelib/thread/qfutureinterface.cpp b/src/corelib/thread/qfutureinterface.cpp
index efbcf9ce583..84d6b09ce8d 100644
--- a/src/corelib/thread/qfutureinterface.cpp
+++ b/src/corelib/thread/qfutureinterface.cpp
@@ -50,6 +50,11 @@
 #  undef interface
 #endif
 
+// GCC 12 gets confused about QFutureInterfaceBase::state, for some non-obvious
+// reason
+//  warning: ‘unsigned int __atomic_or_fetch_4(volatile void*, unsigned int, int)’ writing 4 bytes into a region of size 0 overflows the destination [-Wstringop-overflow=]
+QT_WARNING_DISABLE_GCC("-Wstringop-overflow")
+
 QT_BEGIN_NAMESPACE
 
 enum {
diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp
index c7e5c19c31f..37388750ff0 100644
--- a/src/gui/text/qtextengine.cpp
+++ b/src/gui/text/qtextengine.cpp
@@ -2277,6 +2277,12 @@ QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFix
             if (feCache.prevScaledFontEngine) {
                 scaledEngine = feCache.prevScaledFontEngine;
             } else {
+                // GCC 12 gets confused about QFontEngine::ref, for some non-obvious reason
+                //  warning: ‘unsigned int __atomic_or_fetch_4(volatile void*, unsigned int, int)’ writing 4 bytes
+                //  into a region of size 0 overflows the destination [-Wstringop-overflow=]
+                QT_WARNING_PUSH
+                QT_WARNING_DISABLE_GCC("-Wstringop-overflow")
+
                 QFontEngine *scEngine = rawFont.d->fontEngine->cloneWithSize(smallCapsFraction * rawFont.pixelSize());
                 scEngine->ref.ref();
                 scaledEngine = QFontEngineMulti::createMultiFontEngine(scEngine, script);
@@ -2286,6 +2292,7 @@ QFontEngine *QTextEngine::fontEngine(const QScriptItem &si, QFixed *ascent, QFix
                 if (!scEngine->ref.deref())
                     delete scEngine;
 
+                QT_WARNING_POP
             }
         }
     } else