diff --git a/src/corelib/tools/qhash.h b/src/corelib/tools/qhash.h
index 8446e82624..62f7e9be64 100644
--- a/src/corelib/tools/qhash.h
+++ b/src/corelib/tools/qhash.h
@@ -929,6 +929,8 @@ public:
 #endif // Q_QDOC
 
     inline qsizetype size() const noexcept { return d ? qsizetype(d->size) : 0; }
+
+    [[nodiscard]]
     inline bool isEmpty() const noexcept { return !d || d->size == 0; }
 
     inline qsizetype capacity() const noexcept { return d ? qsizetype(d->numBuckets >> 1) : 0; }
@@ -1363,6 +1365,7 @@ public:
     size_t bucket_count() const noexcept { return d ? d->numBuckets : 0; }
     static size_t max_bucket_count() noexcept { return Data::maxNumBuckets(); }
 
+    [[nodiscard]]
     inline bool empty() const noexcept { return isEmpty(); }
 
 private:
@@ -1609,6 +1612,7 @@ public:
 
     inline qsizetype size() const noexcept { return m_size; }
 
+    [[nodiscard]]
     inline bool isEmpty() const noexcept { return !m_size; }
 
     inline qsizetype capacity() const noexcept { return d ? qsizetype(d->numBuckets >> 1) : 0; }
@@ -2118,6 +2122,7 @@ public:
     size_t bucket_count() const noexcept { return d ? d->numBuckets : 0; }
     static size_t max_bucket_count() noexcept { return Data::maxNumBuckets(); }
 
+    [[nodiscard]]
     inline bool empty() const noexcept { return isEmpty(); }
 
     inline iterator replace(const Key &key, const T &value)
diff --git a/src/corelib/tools/qmap.h b/src/corelib/tools/qmap.h
index 326ae7d8a5..0fd025e2b7 100644
--- a/src/corelib/tools/qmap.h
+++ b/src/corelib/tools/qmap.h
@@ -267,6 +267,7 @@ public:
 
     size_type size() const { return d ? size_type(d->m.size()) : size_type(0); }
 
+    [[nodiscard]]
     bool isEmpty() const { return d ? d->m.empty() : true; }
 
     void detach()
@@ -759,6 +760,7 @@ public:
     }
 
     // STL compatibility
+    [[nodiscard]]
     inline bool empty() const
     {
         return isEmpty();
@@ -938,6 +940,7 @@ public:
 
     size_type size() const { return d ? size_type(d->m.size()) : size_type(0); }
 
+    [[nodiscard]]
     bool isEmpty() const { return d ? d->m.empty() : true; }
 
     void detach()
@@ -1518,6 +1521,7 @@ public:
     }
 
     // STL compatibility
+    [[nodiscard]]
     inline bool empty() const { return isEmpty(); }
 
     std::pair<iterator, iterator> equal_range(const Key &akey)