diff --git a/libavcodec/aarch64/synth_filter_neon.S b/libavcodec/aarch64/synth_filter_neon.S
index 65551cbff75ca4fdc2f695e218bf780ff244e6aa..8fcd71f25251a454e85f729029f91160d3b58655 100644
--- a/libavcodec/aarch64/synth_filter_neon.S
+++ b/libavcodec/aarch64/synth_filter_neon.S
@@ -50,7 +50,7 @@ function ff_synth_filter_float_neon, export=1
         add             x1,  x1,  x7,  lsl #2   // synth_buf
         sub             w8,  w7,  #32
         stp             x5,  x1,  [sp, #16]
-        bic             x7,  x7,  #63
+        and             x7,  x7,  #~63
         and             w8,  w8,  #511
         stp             x7,  x30, [sp, #32]
         str             w8,  [x2]