diff --git a/gcc/ada/gcc-interface/decl.cc b/gcc/ada/gcc-interface/decl.cc
index f6a4c0631b6398960dc7ed3da34bc1d9a636fb0b..8b72c96c4396acac14b3e2fca7bea83f652edd49 100644
--- a/gcc/ada/gcc-interface/decl.cc
+++ b/gcc/ada/gcc-interface/decl.cc
@@ -520,7 +520,8 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition)
 	  esize = UI_To_Int (Esize (gnat_entity));
 
 	  if (IN (kind, Float_Kind))
-	    max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE);
+	    max_esize
+	      = fp_prec_to_size (TYPE_PRECISION (long_double_type_node));
 	  else if (IN (kind, Access_Kind))
 	    max_esize = POINTER_SIZE * 2;
 	  else