diff --git a/src/corelib/tools/qcryptographichash.cpp b/src/corelib/tools/qcryptographichash.cpp
index 3c79bb797d2..51f48503fbc 100644
--- a/src/corelib/tools/qcryptographichash.cpp
+++ b/src/corelib/tools/qcryptographichash.cpp
@@ -387,19 +387,19 @@ void QCryptographicHash::addData(const char *data, int length)
         break;
     case RealSha3_224:
     case Keccak_224:
-        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), length*8);
+        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
         break;
     case RealSha3_256:
     case Keccak_256:
-        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), length*8);
+        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
         break;
     case RealSha3_384:
     case Keccak_384:
-        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), length*8);
+        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
         break;
     case RealSha3_512:
     case Keccak_512:
-        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), length*8);
+        sha3Update(&d->sha3Context, reinterpret_cast<const BitSequence *>(data), quint64(length) * 8);
         break;
 #endif
     }