diff --git a/libavutil/cast5.c b/libavutil/cast5.c
index d07e98b786..98aa19d630 100644
--- a/libavutil/cast5.c
+++ b/libavutil/cast5.c
@@ -529,7 +529,7 @@ int main(int argc, char** argv)
         {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6, 0xb3, 0x43, 0x6f, 0xb8, 0x9d, 0x6d, 0xca, 0x92},
         {0xb2, 0xc9, 0x5e, 0xb0, 0x0c, 0x31, 0xad, 0x71, 0x80, 0xac, 0x05, 0xb8, 0xe8, 0x3d, 0x69, 0x6e}
     };
-    const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
+    static const uint8_t iv[8] = {0xee, 0xa9, 0xd0, 0xa2, 0x49, 0xfd, 0x3b, 0xa6};
     static uint8_t rpt2[2][16];
     int i, j, err = 0;
     static const int key_bits[3] = {128, 80, 40};