diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 3b9f072596..1c71e3fb8a 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1377,6 +1377,7 @@ static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
     int first_slice = 0;
 
     while(1) {
+        GetBitContext gb;
         int nalsize = 0;
         int dst_length, bit_length, consumed;
         const uint8_t *ptr;
@@ -1418,8 +1419,8 @@ static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
         case NAL_DPA:
         case NAL_IDR_SLICE:
         case NAL_SLICE:
-            init_get_bits(&h->gb, ptr, bit_length);
-            if (!get_ue_golomb(&h->gb) ||
+            init_get_bits(&gb, ptr, bit_length);
+            if (!get_ue_golomb(&gb) ||
                 !first_slice ||
                 first_slice != h->nal_unit_type)
                 nals_needed = nal_index;