diff --git a/getpass.py b/getpass.py
index 3ca7fb2..c3fe988 100644
--- a/getpass.py
+++ b/getpass.py
@@ -62,7 +62,7 @@ def unix_getpass(prompt='Password: ', stream=None):
         try:
             old = termios.tcgetattr(fd)     # a copy to save
             new = old[:]
-            new[3] &= ~(termios.ECHO|termios.ISIG)  # 3 == 'lflags'
+            new[3] &= ~(termios.ECHO)  # 3 == 'lflags'
             tcsetattr_flags = termios.TCSAFLUSH
             if hasattr(termios, 'TCSASOFT'):
                 tcsetattr_flags |= termios.TCSASOFT