diff --git a/libavcodec/motion_test.c b/libavcodec/motion_test.c
index f16321dd107c60bbb916704e30e9a14bd041852e..8540b74834958f2bb7eff1dfdfc7bdcd8b270143 100644
--- a/libavcodec/motion_test.c
+++ b/libavcodec/motion_test.c
@@ -37,6 +37,7 @@
 
 int pix_abs16x16_mmx(uint8_t *blk1, uint8_t *blk2, int lx);
 int pix_abs16x16_mmx1(uint8_t *blk1, uint8_t *blk2, int lx);
+int pix_abs16x16_c(uint8_t *blk1, uint8_t *blk2, int lx);
 int pix_abs16x16_x2_mmx(uint8_t *blk1, uint8_t *blk2, int lx);
 int pix_abs16x16_x2_mmx1(uint8_t *blk1, uint8_t *blk2, int lx);
 int pix_abs16x16_x2_c(uint8_t *blk1, uint8_t *blk2, int lx);