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-rw-r--r--Src/utils.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/utils.c b/Src/utils.c
index 32f600858..46cf7bcf6 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -3336,7 +3336,7 @@ morefmt:
 	    case '.':
 	    {
 		long fnsec = nsec;
-		if (digs > 9)
+		if (digs < 0 || digs > 9)
 		    digs = 9;
 		if (ztrftimebuf(&bufsize, digs))
 		    return -1;