diff --git a/libavformat/jacosubdec.c b/libavformat/jacosubdec.c
index 8cb918ccee..68ed7511d7 100644
--- a/libavformat/jacosubdec.c
+++ b/libavformat/jacosubdec.c
@@ -134,6 +134,9 @@ static int get_shift(int timeres, const char *buf)
     int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d);
 #undef SSEP
 
+    if (a == INT_MIN)
+        return 0;
+
     if (*buf == '-' || a < 0) {
         sign = -1;
         a = FFABS(a);