diff --git a/libavcodec/svq1.c b/libavcodec/svq1.c
index a841816af2..24b852b511 100644
--- a/libavcodec/svq1.c
+++ b/libavcodec/svq1.c
@@ -914,6 +914,9 @@ static void svq1_write_header(SVQ1Context *s, int frame_type)
 #define QUALITY_THRESHOLD 100
 #define THRESHOLD_MULTIPLIER 0.6
 
+#if defined(HAVE_ALTIVEC)
+#undef vector
+#endif
 
 static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref, uint8_t *decoded, int stride, int level, int threshold, int lambda, int intra){
     int count, y, x, i, j, split, best_mean, best_score, best_count;