diff --git a/libavcodec/aac_parser.c b/libavcodec/aac_parser.c
index ab6ca4e..cb93ba9 100644
--- a/libavcodec/aac_parser.c
+++ b/libavcodec/aac_parser.c
@@ -34,7 +34,7 @@
     int size;
     union {
         uint64_t u64;
-        uint8_t  u8[8];
+        uint8_t  u8[8 + FF_INPUT_BUFFER_PADDING_SIZE];
     } tmp;
 
     tmp.u64 = av_be2ne64(state);
diff --git a/libavcodec/ac3_parser.c b/libavcodec/ac3_parser.c
index dd6d77c..131e180 100644
--- a/libavcodec/ac3_parser.c
+++ b/libavcodec/ac3_parser.c
@@ -166,7 +166,7 @@
     int err;
     union {
         uint64_t u64;
-        uint8_t  u8[8];
+        uint8_t  u8[8 + FF_INPUT_BUFFER_PADDING_SIZE];
     } tmp = { av_be2ne64(state) };
     AC3HeaderInfo hdr, *phdr = &hdr;
     GetBitContext gbc;