diff --git a/src/mux/muxedit.c b/src/mux/muxedit.c
index 32ce3d7b..d074be61 100644
--- a/src/mux/muxedit.c
+++ b/src/mux/muxedit.c
@@ -43,9 +43,16 @@ static void DeleteAllChunks(WebPChunk** const chunk_list) {
   }
 }
 
+// Delete all images in 'wpi_list'.
+static void DeleteAllImages(WebPMuxImage** const wpi_list) {
+  while (*wpi_list != NULL) {
+    *wpi_list = MuxImageDelete(*wpi_list);
+  }
+}
+
 static void MuxRelease(WebPMux* const mux) {
   if (mux == NULL) return;
-  MuxImageDeleteAll(&mux->images_);
+  DeleteAllImages(&mux->images_);
   DeleteAllChunks(&mux->vp8x_);
   DeleteAllChunks(&mux->iccp_);
   DeleteAllChunks(&mux->anim_);
@@ -273,7 +280,7 @@ WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream,
 
   if (mux->images_ != NULL) {
     // Only one 'simple image' can be added in mux. So, remove present images.
-    MuxImageDeleteAll(&mux->images_);
+    DeleteAllImages(&mux->images_);
   }
 
   MuxImageInit(&wpi);
@@ -630,6 +637,35 @@ static WebPMuxError MuxCleanup(WebPMux* const mux) {
   return WEBP_MUX_OK;
 }
 
+// Total size of a list of chunks.
+static size_t ChunkListDiskSize(const WebPChunk* chunk_list) {
+  size_t size = 0;
+  while (chunk_list != NULL) {
+    size += ChunkDiskSize(chunk_list);
+    chunk_list = chunk_list->next_;
+  }
+  return size;
+}
+
+// Total size of a list of images.
+static size_t ImageListDiskSize(const WebPMuxImage* wpi_list) {
+  size_t size = 0;
+  while (wpi_list != NULL) {
+    size += MuxImageDiskSize(wpi_list);
+    wpi_list = wpi_list->next_;
+  }
+  return size;
+}
+
+// Write out the given list of images into 'dst'.
+static uint8_t* ImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst) {
+  while (wpi_list != NULL) {
+    dst = MuxImageEmit(wpi_list, dst);
+    wpi_list = wpi_list->next_;
+  }
+  return dst;
+}
+
 WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
   size_t size = 0;
   uint8_t* data = NULL;
@@ -647,10 +683,10 @@ WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
   if (err != WEBP_MUX_OK) return err;
 
   // Allocate data.
-  size = ChunksListDiskSize(mux->vp8x_) + ChunksListDiskSize(mux->iccp_)
-       + ChunksListDiskSize(mux->anim_) + MuxImageListDiskSize(mux->images_)
-       + ChunksListDiskSize(mux->exif_) + ChunksListDiskSize(mux->xmp_)
-       + ChunksListDiskSize(mux->unknown_) + RIFF_HEADER_SIZE;
+  size = ChunkListDiskSize(mux->vp8x_) + ChunkListDiskSize(mux->iccp_)
+       + ChunkListDiskSize(mux->anim_) + ImageListDiskSize(mux->images_)
+       + ChunkListDiskSize(mux->exif_) + ChunkListDiskSize(mux->xmp_)
+       + ChunkListDiskSize(mux->unknown_) + RIFF_HEADER_SIZE;
 
   data = (uint8_t*)malloc(size);
   if (data == NULL) return WEBP_MUX_MEMORY_ERROR;
@@ -660,7 +696,7 @@ WebPMuxError WebPMuxAssemble(WebPMux* mux, WebPData* assembled_data) {
   dst = ChunkListEmit(mux->vp8x_, dst);
   dst = ChunkListEmit(mux->iccp_, dst);
   dst = ChunkListEmit(mux->anim_, dst);
-  dst = MuxImageListEmit(mux->images_, dst);
+  dst = ImageListEmit(mux->images_, dst);
   dst = ChunkListEmit(mux->exif_, dst);
   dst = ChunkListEmit(mux->xmp_, dst);
   dst = ChunkListEmit(mux->unknown_, dst);
diff --git a/src/mux/muxi.h b/src/mux/muxi.h
index 0aa89707..3a5044ec 100644
--- a/src/mux/muxi.h
+++ b/src/mux/muxi.h
@@ -143,9 +143,6 @@ static WEBP_INLINE size_t ChunkDiskSize(const WebPChunk* chunk) {
   return SizeWithPadding(data_size);
 }
 
-// Total size of a list of chunks.
-size_t ChunksListDiskSize(const WebPChunk* chunk_list);
-
 // Write out the given list of chunks into 'dst'.
 uint8_t* ChunkListEmit(const WebPChunk* chunk_list, uint8_t* dst);
 
@@ -167,9 +164,6 @@ WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi);
 // 'wpi' can be NULL.
 WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi);
 
-// Delete all images in 'wpi_list'.
-void MuxImageDeleteAll(WebPMuxImage** const wpi_list);
-
 // Count number of images matching the given tag id in the 'wpi_list'.
 // If id == WEBP_CHUNK_NIL, all images will be matched.
 int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id);
@@ -185,19 +179,6 @@ static WEBP_INLINE int IsWPI(WebPChunkId id) {
   }
 }
 
-// Get a reference to appropriate chunk list within an image given chunk tag.
-static WEBP_INLINE WebPChunk** MuxImageGetListFromId(
-    const WebPMuxImage* const wpi, WebPChunkId id) {
-  assert(wpi != NULL);
-  switch (id) {
-    case WEBP_CHUNK_ANMF:
-    case WEBP_CHUNK_FRGM:  return (WebPChunk**)&wpi->header_;
-    case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
-    case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
-    default: return NULL;
-  }
-}
-
 // Pushes 'wpi' at the end of 'wpi_list'.
 WebPMuxError MuxImagePush(const WebPMuxImage* wpi, WebPMuxImage** wpi_list);
 
@@ -211,15 +192,9 @@ WebPMuxError MuxImageGetNth(const WebPMuxImage** wpi_list, uint32_t nth,
 // Total size of the given image.
 size_t MuxImageDiskSize(const WebPMuxImage* const wpi);
 
-// Total size of a list of images.
-size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list);
-
 // Write out the given image into 'dst'.
 uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst);
 
-// Write out the given list of images into 'dst'.
-uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst);
-
 //------------------------------------------------------------------------------
 // Helper methods for mux.
 
diff --git a/src/mux/muxinternal.c b/src/mux/muxinternal.c
index 2428c597..8ea90bbd 100644
--- a/src/mux/muxinternal.c
+++ b/src/mux/muxinternal.c
@@ -189,15 +189,6 @@ WebPChunk* ChunkDelete(WebPChunk* const chunk) {
 //------------------------------------------------------------------------------
 // Chunk serialization methods.
 
-size_t ChunksListDiskSize(const WebPChunk* chunk_list) {
-  size_t size = 0;
-  while (chunk_list != NULL) {
-    size += ChunkDiskSize(chunk_list);
-    chunk_list = chunk_list->next_;
-  }
-  return size;
-}
-
 static uint8_t* ChunkEmit(const WebPChunk* const chunk, uint8_t* dst) {
   const size_t chunk_size = chunk->data_.size;
   assert(chunk);
@@ -242,6 +233,19 @@ WebPMuxImage* MuxImageRelease(WebPMuxImage* const wpi) {
 //------------------------------------------------------------------------------
 // MuxImage search methods.
 
+// Get a reference to appropriate chunk list within an image given chunk tag.
+static WebPChunk** GetChunkListFromId(const WebPMuxImage* const wpi,
+                                      WebPChunkId id) {
+  assert(wpi != NULL);
+  switch (id) {
+    case WEBP_CHUNK_ANMF:
+    case WEBP_CHUNK_FRGM:  return (WebPChunk**)&wpi->header_;
+    case WEBP_CHUNK_ALPHA: return (WebPChunk**)&wpi->alpha_;
+    case WEBP_CHUNK_IMAGE: return (WebPChunk**)&wpi->img_;
+    default: return NULL;
+  }
+}
+
 int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
   int count = 0;
   const WebPMuxImage* current;
@@ -249,7 +253,7 @@ int MuxImageCount(const WebPMuxImage* wpi_list, WebPChunkId id) {
     if (id == WEBP_CHUNK_NIL) {
       ++count;  // Special case: count all images.
     } else {
-      const WebPChunk* const wpi_chunk = *MuxImageGetListFromId(current, id);
+      const WebPChunk* const wpi_chunk = *GetChunkListFromId(current, id);
       if (wpi_chunk != NULL) {
         const WebPChunkId wpi_chunk_id = ChunkGetIdFromTag(wpi_chunk->tag_);
         if (wpi_chunk_id == id) ++count;  // Count images with a matching 'id'.
@@ -318,12 +322,6 @@ WebPMuxImage* MuxImageDelete(WebPMuxImage* const wpi) {
   return next;
 }
 
-void MuxImageDeleteAll(WebPMuxImage** const wpi_list) {
-  while (*wpi_list != NULL) {
-    *wpi_list = MuxImageDelete(*wpi_list);
-  }
-}
-
 WebPMuxError MuxImageDeleteNth(WebPMuxImage** wpi_list, uint32_t nth) {
   assert(wpi_list);
   if (!SearchImageToGetOrDelete(wpi_list, nth, &wpi_list)) {
@@ -360,15 +358,6 @@ size_t MuxImageDiskSize(const WebPMuxImage* const wpi) {
   return size;
 }
 
-size_t MuxImageListDiskSize(const WebPMuxImage* wpi_list) {
-  size_t size = 0;
-  while (wpi_list != NULL) {
-    size += MuxImageDiskSize(wpi_list);
-    wpi_list = wpi_list->next_;
-  }
-  return size;
-}
-
 // Special case as ANMF/FRGM chunk encapsulates other image chunks.
 static uint8_t* ChunkEmitSpecial(const WebPChunk* const header,
                                  size_t total_size, uint8_t* dst) {
@@ -400,14 +389,6 @@ uint8_t* MuxImageEmit(const WebPMuxImage* const wpi, uint8_t* dst) {
   return dst;
 }
 
-uint8_t* MuxImageListEmit(const WebPMuxImage* wpi_list, uint8_t* dst) {
-  while (wpi_list != NULL) {
-    dst = MuxImageEmit(wpi_list, dst);
-    wpi_list = wpi_list->next_;
-  }
-  return dst;
-}
-
 //------------------------------------------------------------------------------
 // Helper methods for mux.