diff --git a/src/mux/muxi.h b/src/mux/muxi.h
index b73e3fbd..6086e74a 100644
--- a/src/mux/muxi.h
+++ b/src/mux/muxi.h
@@ -14,6 +14,7 @@
 #ifndef WEBP_MUX_MUXI_H_
 #define WEBP_MUX_MUXI_H_
 
+#include <assert.h>
 #include <stdlib.h>
 #include "src/dec/vp8i_dec.h"
 #include "src/dec/vp8li_dec.h"
@@ -143,13 +144,13 @@ void ChunkListDelete(WebPChunk** const chunk_list);
 
 // Returns size of the chunk including chunk header and padding byte (if any).
 static WEBP_INLINE size_t SizeWithPadding(size_t chunk_size) {
+  assert(chunk_size <= MAX_CHUNK_PAYLOAD);
   return CHUNK_HEADER_SIZE + ((chunk_size + 1) & ~1U);
 }
 
 // Size of a chunk including header and padding.
 static WEBP_INLINE size_t ChunkDiskSize(const WebPChunk* chunk) {
   const size_t data_size = chunk->data_.size;
-  assert(data_size < MAX_CHUNK_PAYLOAD);
   return SizeWithPadding(data_size);
 }
 
diff --git a/src/mux/muxread.c b/src/mux/muxread.c
index eb5070b1..ef50dae5 100644
--- a/src/mux/muxread.c
+++ b/src/mux/muxread.c
@@ -59,6 +59,7 @@ static WebPMuxError ChunkVerifyAndAssign(WebPChunk* chunk,
   // Sanity checks.
   if (data_size < CHUNK_HEADER_SIZE) return WEBP_MUX_NOT_ENOUGH_DATA;
   chunk_size = GetLE32(data + TAG_SIZE);
+  if (chunk_size > MAX_CHUNK_PAYLOAD) return WEBP_MUX_BAD_DATA;
 
   {
     const size_t chunk_disk_size = SizeWithPadding(chunk_size);
@@ -203,9 +204,14 @@ WebPMux* WebPMuxCreateInternal(const WebPData* bitstream, int copy_data,
     goto Err;  // First chunk should be VP8, VP8L or VP8X.
   }
 
-  riff_size = SizeWithPadding(GetLE32(data + TAG_SIZE));
+  riff_size = GetLE32(data + TAG_SIZE);
+  if (riff_size > MAX_CHUNK_PAYLOAD) goto Err;
+
+  // Note this padding is historical and differs from demux.c which does not
+  // pad the file size.
+  riff_size = SizeWithPadding(riff_size);
   if (riff_size < CHUNK_HEADER_SIZE) goto Err;
-  if (riff_size > MAX_CHUNK_PAYLOAD || riff_size > size) goto Err;
+  if (riff_size > size) goto Err;
   // There's no point in reading past the end of the RIFF chunk.
   if (size > riff_size + CHUNK_HEADER_SIZE) {
     size = riff_size + CHUNK_HEADER_SIZE;