diff --git a/libavfilter/x86/vf_blackdetect.asm b/libavfilter/x86/vf_blackdetect.asm
index 86251ceca5..a9d4778aee 100644
--- a/libavfilter/x86/vf_blackdetect.asm
+++ b/libavfilter/x86/vf_blackdetect.asm
@@ -68,6 +68,8 @@ cglobal blackdetect_%1, 5, 7, 2, src, stride, width, height, threshold
         RET
 %endmacro
 
+%if HAVE_AVX2_EXTERNAL
 INIT_YMM avx2
 count_pixels_fn 8
 count_pixels_fn 16
+%endif