diff --git a/build/pymake/pymake/process.py b/build/pymake/pymake/process.py
index 5cc2b6e0ab6..2f2114dac0f 100644
--- a/build/pymake/pymake/process.py
+++ b/build/pymake/pymake/process.py
@@ -15,7 +15,7 @@ if sys.platform=='win32':
 _log = logging.getLogger('pymake.process')
 
 _escapednewlines = re.compile(r'\\\n')
-_blacklist = re.compile(r'[$><;[{~`|&]')
+_blacklist = re.compile(r'[$><;[{~`|&()]')
 _needsglob = re.compile(r'[\*\?]')
 def clinetoargv(cline):
     """