diff --git a/src/dfasearch.c b/src/dfasearch.c
index 44eb08a..780891f 100644
--- a/src/dfasearch.c
+++ b/src/dfasearch.c
@@ -61,10 +61,10 @@ dfaerror (char const *mesg)
void
dfawarn (char const *mesg)
{
- static enum { NONE = 0, POSIX, GNU } mode;
- if (mode == NONE)
- mode = (getenv ("POSIXLY_CORRECT") ? POSIX : GNU);
- if (mode == GNU)
+ static enum { DW_NONE = 0, DW_POSIX, DW_GNU } mode;
+ if (mode == DW_NONE)
+ mode = (getenv ("POSIXLY_CORRECT") ? DW_POSIX : DW_GNU);
+ if (mode == DW_GNU)
dfaerror (mesg);
}