diff --git a/src/corelib/tools/qoffsetstringarray_p.h b/src/corelib/tools/qoffsetstringarray_p.h
index 678e4102501..72df8f17375 100644
--- a/src/corelib/tools/qoffsetstringarray_p.h
+++ b/src/corelib/tools/qoffsetstringarray_p.h
@@ -65,9 +65,11 @@ struct OffsetSequenceHelper : OffsetSequenceHelper<N - 1, O + I, Idx..., O> { };
 template<int Last, int I, int S, int ... Idx>
 struct OffsetSequenceHelper<1, Last, I, S, Idx...> : IndexesList<Last + I, Idx..., Last>
 {
+    // the unary + before std::numeric_limits below is required. Otherwise we get on g++-10.2:
+    // error: comparison is always false due to limited range of data type [-Werror=type-limits]
     static const constexpr auto Length = Last + I;
     using Type = typename std::conditional<
-        Last <= std::numeric_limits<quint8>::max(),
+        Last <= +std::numeric_limits<quint8>::max(),
         quint8,
         typename std::conditional<
             Last <= std::numeric_limits<quint16>::max(),