Avoid a warning about an unused variable

diff --git a/source/differentiation/ad/ad_helpers.cc b/source/differentiation/ad/ad_helpers.cc
index fac44b98a5bdfe691e874fdd1bc61a82fd653368..948f00ba2f4cbdf67a20e42b12a91aa51df30cad 100644 (file)
--- a/source/differentiation/ad/ad_helpers.cc
+++ b/source/differentiation/ad/ad_helpers.cc
@@ -459,6 +459,7 @@ namespace Differentiation
             // duration of the simulation, we create a global live variable
             // that doesn't go out of scope.
             static ad_type num = 0.0;
+            (void)num;
           }
     }