diff --git a/include/boost/multiprecision/mpfr.hpp b/include/boost/multiprecision/mpfr.hpp
index 591469b5..a04a3f2f 100644
--- a/include/boost/multiprecision/mpfr.hpp
+++ b/include/boost/multiprecision/mpfr.hpp
@@ -30,6 +30,9 @@ namespace backends{
 template <unsigned digits10, mpfr_allocation_type AllocationType = allocate_dynamic>
 struct mpfr_float_backend;
 
+template <>
+struct mpfr_float_backend<0, allocate_stack>;
+
 } // namespace backends
 
 template <unsigned digits10, mpfr_allocation_type AllocationType>