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-rw-r--r--src/minutils/s6-mount.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/minutils/s6-mount.c b/src/minutils/s6-mount.c
index b6ac674..bb6db81 100644
--- a/src/minutils/s6-mount.c
+++ b/src/minutils/s6-mount.c
@@ -16,7 +16,7 @@
 
 #define SWITCH(opt) do
 #define HCTIWS(opt) while(0) ;
-#define CASE(s) if (!str_diffn(opt, (s), str_len(s)))
+#define CASE(s) if (n == sizeof(s) - 1 && !str_diffn(opt, (s), n))
 
 static void scanopt (stralloc *data, unsigned long *flags, char const *opt)
 {