diff --git a/src/libqof/qof/qofint128.cpp b/src/libqof/qof/qofint128.cpp
index 1268d9e0e2..a5c0a4d709 100644
--- a/src/libqof/qof/qofint128.cpp
+++ b/src/libqof/qof/qofint128.cpp
@@ -246,7 +246,7 @@ QofInt128::operator<<= (uint i) noexcept
         m_lo = 0;
         return *this;
     }
-    uint64_t carry {(m_lo & (((1 << i) - 1) << (legbits - i)))};
+    uint64_t carry {(m_lo & (((UINT64_C(1) << i) - 1) << (legbits - i)))};
     m_lo <<= i;
     m_hi <<= i;
     m_hi += carry;
@@ -263,7 +263,7 @@ QofInt128::operator>>= (uint i) noexcept
         m_lo = 0;
         return *this;
     }
-    uint64_t carry {(m_hi & ((1 << i) - 1))};
+    uint64_t carry {(m_hi & ((UINT64_C(1) << i) - 1))};
     m_lo >>= i;
     m_hi >>= i;
     m_lo += (carry << (legbits - i));