diff --git a/src/main/python/fobis/ParsedFile.py b/src/main/python/fobis/ParsedFile.py
index 0cef87d..2e1303e 100644
--- a/src/main/python/fobis/ParsedFile.py
+++ b/src/main/python/fobis/ParsedFile.py
@@ -341,7 +341,12 @@ def parse(self, inc=['.INC', '.F', '.FOR', '.FPP', '.F77', '.F90', '.F95', '.F03
           preprocessor += ' -C -w '
         elif preprocessor == 'fpp':
           preprocessor += ' -w '
-        source = str(check_output(preprocessor + ' ' + preproc + ' ' + '-I'.join(include) + ' ' + self.name, shell=True, stderr=STDOUT, encoding='UTF-8'))
+        if preproc is None:
+            preproc = ''
+        includes = ' '
+        if len(include) > 0 :
+            includes = ' -I' + '-I'.join(include) + ' '
+        source = str(check_output(preprocessor + ' ' + preproc + includes + self.name, shell=True, stderr=STDOUT, encoding='UTF-8'))
         source = source.replace('\\n', '\n')
       else:
         source = str(openReader(self.name).read())
diff --git a/src/main/python/fobis/__pycache__/ParsedFile.cpython-310.pyc b/src/main/python/fobis/__pycache__/ParsedFile.cpython-310.pyc
index b584345..eaa330d 100644
Binary files a/src/main/python/fobis/__pycache__/ParsedFile.cpython-310.pyc and b/src/main/python/fobis/__pycache__/ParsedFile.cpython-310.pyc differ
diff --git a/src/main/python/fobis/__pycache__/fobis.cpython-310.pyc b/src/main/python/fobis/__pycache__/fobis.cpython-310.pyc
index d231e41..fdcd057 100644
Binary files a/src/main/python/fobis/__pycache__/fobis.cpython-310.pyc and b/src/main/python/fobis/__pycache__/fobis.cpython-310.pyc differ