diff --git a/blas/CMakeLists.txt b/blas/CMakeLists.txt
index 61844b67c..8c6792ad1 100644
--- a/blas/CMakeLists.txt
+++ b/blas/CMakeLists.txt
@@ -1,7 +1,7 @@
 
 project(EigenBlas CXX)
 
-if( ( NOT DEFINED EIGEN_Fortran_COMPILER_WORKS ) OR EIGEN_Fortran_COMPILER_WORKS)
+if( NOT DEFINED EIGEN_Fortran_COMPILER_WORKS OR EIGEN_Fortran_COMPILER_WORKS)
 
   enable_language(Fortran OPTIONAL)