diff --git a/scripts.d/50-x265.sh b/scripts.d/50-x265.sh
index 1ae1384..60dc221 100755
--- a/scripts.d/50-x265.sh
+++ b/scripts.d/50-x265.sh
@@ -20,6 +20,7 @@ ffbuild_dockerbuild() {
         -DENABLE_SHARED=OFF
         -DENABLE_CLI=OFF
         -DCMAKE_ASM_NASM_FLAGS=-w-macro-params-legacy
+        -DENABLE_ALPHA=ON
     )
 
     if [[ $TARGET != *32 ]]; then