diff --git a/examples/heat-equation/HeatEquationBuildConfigTag.h b/examples/heat-equation/HeatEquationBuildConfigTag.h
index 7fafaf613154b31660faa0ddcb92d22d837fdffb..0e0389ca74fa62367ec6d1facd07ac18c528ad9a 100644
--- a/examples/heat-equation/HeatEquationBuildConfigTag.h
+++ b/examples/heat-equation/HeatEquationBuildConfigTag.h
@@ -29,7 +29,7 @@ template<> struct ConfigTagReal< HeatEquationBuildConfigTag, long double > { enu
  * Turn off support for short int and long int indexing.
  */
 template<> struct ConfigTagIndex< HeatEquationBuildConfigTag, short int >{ enum { enabled = false }; };
-template<> struct ConfigTagIndex< HeatEquationBuildConfigTag, long int >{ enum { enabled = true }; };
+template<> struct ConfigTagIndex< HeatEquationBuildConfigTag, long int >{ enum { enabled = false }; };
 
 /****
  * Please, chose your preferred time discretization  here.