driver: Make sure we have room for the '\0' byte

1 files changed, 2 insertions, 2 deletions

diff --git a/driver.c b/driver.c
index 7bb2be2..5c8b4be 100644
--- a/driver.c
+++ b/driver.c
@@ -310,10 +310,10 @@ compilecommand(void)
 	char self[PATH_MAX], *cmd;
 	ssize_t n;
 
-	n = readlink("/proc/self/exe", self, sizeof(self) - 4);
+	n = readlink("/proc/self/exe", self, sizeof(self) - 5);
 	if (n < 0)
 		fatal("readlink /proc/self/exe:");
-	if (n == sizeof(self) - 4)
+	if (n == sizeof(self) - 5)
 		fatal("target of /proc/self/exe is too large");
 	strcpy(self + n, "-qbe");
 	if (access(self, X_OK) < 0)