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diff --git a/alsactl/lock.c b/alsactl/lock.c
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index d34d013..fce208b 100644
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--- a/alsactl/lock.c
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+++ b/alsactl/lock.c
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@@ -35,7 +35,7 @@ static int state_lock_(const char *file, int lock, int timeout)
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 	int fd = -1, err = 0;
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 	struct flock lck;
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 	struct stat st;
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-	char lcktxt[11];
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+	char lcktxt[12];
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 	char *nfile;
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 	if (!do_lock)