Update decode.c

1 files changed, 3 insertions, 3 deletions

diff --git a/dec/decode.c b/dec/decode.c
index 892a254..a614c55 100644
--- a/dec/decode.c
+++ b/dec/decode.c
@@ -1714,13 +1714,13 @@ postReadDistance:
   } else {
     const uint8_t *ringbuffer_end_minus_copy_length =
         s->ringbuffer_end - i;
+    uint8_t* copy_src = &s->ringbuffer[
+        (pos - s->distance_code) & s->ringbuffer_mask];
+    uint8_t* copy_dst = &s->ringbuffer[pos];
     /* Check for possible underflow and clamp the pointer to 0. */
     if (PREDICT_FALSE(s->ringbuffer_end < (const uint8_t*)0 + i)) {
       ringbuffer_end_minus_copy_length = 0;
     }
-    uint8_t* copy_src = &s->ringbuffer[
-        (pos - s->distance_code) & s->ringbuffer_mask];
-    uint8_t* copy_dst = &s->ringbuffer[pos];
     /* update the recent distances cache */
     s->dist_rb[s->dist_rb_idx & 3] = s->distance_code;
     ++s->dist_rb_idx;