diff --git a/MathLib/LinAlg/PETSc/PETScMatrix.cpp b/MathLib/LinAlg/PETSc/PETScMatrix.cpp
index 5c504d2488bae67cd922dac25670d56cd6a0f5a9..2cafefa044544c331b6332991d91eae0c73d4cb9 100644
--- a/MathLib/LinAlg/PETSc/PETScMatrix.cpp
+++ b/MathLib/LinAlg/PETSc/PETScMatrix.cpp
@@ -75,8 +75,7 @@ void PETScMatrix::viewer(const std::string &file_name, const PetscViewerFormat v
     MatView(_A,viewer);
 
 // This preprocessor is only for debugging, e.g. dump the matrix and exit the program.
-// To activate, remove 'non' in the following line.  
-#define nonEXIT_TEST  
+//#define EXIT_TEST  
 #ifdef EXIT_TEST
     MatDestroy(&_A);
     PetscFinalize();