diff --git a/doc/mkdocdeps.py b/doc/mkdocdeps.py
index de1cbb8f..b87fe3e8 100644
--- a/doc/mkdocdeps.py
+++ b/doc/mkdocdeps.py
@@ -9,10 +9,10 @@ import conf
 
 roff_files = []
 rst_files = []
-out=open(outfile,'w')
 for page in conf.man_pages:
     rst_files = rst_files + ["{0:s}/{1:s}.rst".format(srcdir,page[0])]
     roff_files = roff_files + ["{0:s}/man/{1:s}.{2:d}".format(builddir,page[0],page[4])]
 
-out.write ('MAN_ROFF_FILES := ' + ' \\\n\t'.join(roff_files)+'\n')
-out.write ('MAN_RST_FILES := ' + ' \\\n\t'.join(rst_files)+'\n')
+with open(outfile, 'w') as out:
+    out.write('MAN_ROFF_FILES := ' + ' \\\n\t'.join(roff_files) + '\n')
+    out.write('MAN_RST_FILES := ' + ' \\\n\t'.join(rst_files) + '\n')