1 files changed, 1 insertions, 1 deletions
diff --git a/debug.c b/debug.c
index 7d7798b..91e874f 100644
--- a/debug.c
+++ b/debug.c
@@ -29,7 +29,7 @@ void debug_init(void)
 	regex_t pat_cmdline;
 	regmatch_t matches[2];
 
-	if (!fd)
+	if (fd < 0)
 		return;
 
 	r = read(fd, line, sizeof(line) - 1);