diff --git a/src/FixedPointDecimals.jl b/src/FixedPointDecimals.jl
index 8aec0fb..f02f4c6 100644
--- a/src/FixedPointDecimals.jl
+++ b/src/FixedPointDecimals.jl
@@ -490,6 +490,9 @@ function max_exp10(::Type{T}) where {T <: Integer}
 end
 
 max_exp10(::Type{BigInt}) = -1
+# Freeze the evaluation for Int128, since max_exp10(Int128) is too compilicated to get
+# optimized away by the compiler during const-folding.
+@eval max_exp10(::Type{Int128}) = $(max_exp10(Int128))
 
 """
     coefficient(::Type{FD{T, f}}) -> T