diff --git a/develop/detail/conversions/to_chars.hpp b/develop/detail/conversions/to_chars.hpp
index 73d3a087..549ff01e 100644
--- a/develop/detail/conversions/to_chars.hpp
+++ b/develop/detail/conversions/to_chars.hpp
@@ -204,7 +204,7 @@ boundaries compute_boundaries(FloatType value)
 
     const bool is_denormal = (E == 0);
     const diyfp v = is_denormal
-                    ? diyfp(F, 1 - kBias)
+                    ? diyfp(F, kMinExp)
                     : diyfp(F + kHiddenBit, static_cast<int>(E) - kBias);
 
     // Compute the boundaries m- and m+ of the floating-point value