diff --git a/src/crypto/SymmetricCipher.h b/src/crypto/SymmetricCipher.h
index 65cab76f..b8b3eb13 100644
--- a/src/crypto/SymmetricCipher.h
+++ b/src/crypto/SymmetricCipher.h
@@ -59,11 +59,11 @@ public:
         return m_backend->process(data, ok);
     }
 
-    inline bool processInPlace(QByteArray& data) {
+    inline bool processInPlace(QByteArray& data) Q_REQUIRED_RESULT {
         return m_backend->processInPlace(data);
     }
 
-    inline bool processInPlace(QByteArray& data, quint64 rounds) {
+    inline bool processInPlace(QByteArray& data, quint64 rounds) Q_REQUIRED_RESULT {
         Q_ASSERT(rounds > 0);
         return m_backend->processInPlace(data, rounds);
     }
diff --git a/src/crypto/SymmetricCipherBackend.h b/src/crypto/SymmetricCipherBackend.h
index 763ffb40..8f19b8ed 100644
--- a/src/crypto/SymmetricCipherBackend.h
+++ b/src/crypto/SymmetricCipherBackend.h
@@ -29,8 +29,8 @@ public:
     virtual bool setIv(const QByteArray& iv) = 0;
 
     virtual QByteArray process(const QByteArray& data, bool* ok) = 0;
-    virtual bool processInPlace(QByteArray& data) = 0;
-    virtual bool processInPlace(QByteArray& data, quint64 rounds) = 0;
+    virtual bool processInPlace(QByteArray& data) Q_REQUIRED_RESULT = 0;
+    virtual bool processInPlace(QByteArray& data, quint64 rounds) Q_REQUIRED_RESULT = 0;
 
     virtual bool reset() = 0;
     virtual int blockSize() const = 0;
diff --git a/src/crypto/SymmetricCipherGcrypt.h b/src/crypto/SymmetricCipherGcrypt.h
index bc156009..367ee5b9 100644
--- a/src/crypto/SymmetricCipherGcrypt.h
+++ b/src/crypto/SymmetricCipherGcrypt.h
@@ -35,8 +35,8 @@ public:
     bool setIv(const QByteArray& iv);
 
     QByteArray process(const QByteArray& data, bool* ok);
-    bool processInPlace(QByteArray& data);
-    bool processInPlace(QByteArray& data, quint64 rounds);
+    bool processInPlace(QByteArray& data) Q_REQUIRED_RESULT;
+    bool processInPlace(QByteArray& data, quint64 rounds) Q_REQUIRED_RESULT;
 
     bool reset();
     int blockSize() const;
diff --git a/src/format/KeePass2RandomStream.h b/src/format/KeePass2RandomStream.h
index c951a95a..022c8399 100644
--- a/src/format/KeePass2RandomStream.h
+++ b/src/format/KeePass2RandomStream.h
@@ -29,7 +29,7 @@ public:
     bool init(const QByteArray& key);
     QByteArray randomBytes(int size, bool* ok);
     QByteArray process(const QByteArray& data, bool* ok);
-    bool processInPlace(QByteArray& data);
+    bool processInPlace(QByteArray& data) Q_REQUIRED_RESULT;
     QString errorString() const;
 
 private:
diff --git a/src/format/KeePass2XmlReader.cpp b/src/format/KeePass2XmlReader.cpp
index c3844886..ed5715cb 100644
--- a/src/format/KeePass2XmlReader.cpp
+++ b/src/format/KeePass2XmlReader.cpp
@@ -877,7 +877,9 @@ QPair<QString, QString> KeePass2XmlReader::parseEntryBinary(Entry* entry)
                         && (attr.value("Protected") == "True");
 
                 if (isProtected && !value.isEmpty()) {
-                    m_randomStream->processInPlace(value);
+                    if (!m_randomStream->processInPlace(value)) {
+                        raiseError(m_randomStream->errorString());
+                    }
                 }
             }
 
diff --git a/src/keys/CompositeKey.cpp b/src/keys/CompositeKey.cpp
index 31485186..4fae5f91 100644
--- a/src/keys/CompositeKey.cpp
+++ b/src/keys/CompositeKey.cpp
@@ -186,7 +186,7 @@ void TransformKeyBenchmarkThread::run()
     t.start();
 
     do {
-        cipher.processInPlace(key, 100);
+        Q_UNUSED(cipher.processInPlace(key, 100));
         m_rounds += 100;
     } while (t.elapsed() < m_msec);
 }
diff --git a/tests/TestKeePass2RandomStream.cpp b/tests/TestKeePass2RandomStream.cpp
index b41f1e87..cb881337 100644
--- a/tests/TestKeePass2RandomStream.cpp
+++ b/tests/TestKeePass2RandomStream.cpp
@@ -49,7 +49,7 @@ void TestKeePass2RandomStream::test()
 
     QByteArray cipherPad;
     cipherPad.fill('\0', Size);
-    cipher.processInPlace(cipherPad);
+    QVERIFY(cipher.processInPlace(cipherPad));
 
     QByteArray cipherData;
     cipherData.resize(Size);
@@ -68,7 +68,7 @@ void TestKeePass2RandomStream::test()
     randomStreamData.append(randomStream.process(data.mid(7, 1), &ok));
     QVERIFY(ok);
     QByteArray tmpData = data.mid(8, 12);
-    randomStream.processInPlace(tmpData);
+    QVERIFY(randomStream.processInPlace(tmpData));
     randomStreamData.append(tmpData);
     randomStreamData.append(randomStream.process(data.mid(20, 44), &ok));
     QVERIFY(ok);