diff --git a/hls/ngx_rtmp_mpegts.c b/hls/ngx_rtmp_mpegts.c
index bd5d8cc..ab5c261 100644
--- a/hls/ngx_rtmp_mpegts.c
+++ b/hls/ngx_rtmp_mpegts.c
@@ -290,7 +290,15 @@ ngx_rtmp_mpegts_init_encryption(ngx_rtmp_mpegts_file_t *file,
     }
 
     ngx_memzero(file->iv, 8);
-    ngx_memcpy(file->iv + 8, &iv, 8);
+
+    file->iv[8]  = iv >> 56;
+    file->iv[9]  = iv >> 48;
+    file->iv[10] = iv >> 40;
+    file->iv[11] = iv >> 32;
+    file->iv[12] = iv >> 24;
+    file->iv[13] = iv >> 16;
+    file->iv[14] = iv >> 8;
+    file->iv[15] = iv;
 
     file->encrypt = 1;