diff --git a/tests/run_tests.py b/tests/run_tests.py
index 70ea4c3dc9..338732c142 100755
--- a/tests/run_tests.py
+++ b/tests/run_tests.py
@@ -128,10 +128,8 @@ class Test(object):
         if self.mpi:
             if os.path.exists(os.path.join(MPI_DIR, 'bin', 'mpifort')):
                 self.fc = os.path.join(MPI_DIR, 'bin', 'mpifort')
-            elif os.path.exists(os.path.join(MPI_DIR, 'bin', 'mpif90')):
-                self.fc = os.path.join(MPI_DIR, 'bin', 'mpif90')
             else:
-                raise RuntimeError('Cannot find an MPI Fortran compiler')
+                self.fc = os.path.join(MPI_DIR, 'bin', 'mpif90')
         else:
             self.fc = FC