diff --git a/apexd/apex_file.cpp b/apexd/apex_file.cpp
index f5b76d6..152e580 100644
--- a/apexd/apex_file.cpp
+++ b/apexd/apex_file.cpp
@@ -25,7 +25,6 @@
 #include <fstream>
 #include <span>
 
-#include <android-base/endian.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
 #include <android-base/scopeguard.h>
@@ -76,28 +75,6 @@
   return Error() << "Couldn't find filesystem magic";
 }
 
-Result<uint32_t> GetApexFileSize(borrowed_fd fd) {
-  struct stat st;
-  if (fstat(fd.get(), &st) != 0) {
-    return ErrnoError() << "fstat() failed.";
-  }
-  if (S_ISREG(st.st_mode)) {
-    return static_cast<uint32_t>(st.st_size);
-  }
-  // The size of a "block" apex is at the end of it.
-  if (S_ISBLK(st.st_mode)) {
-    uint32_t file_size = 0;
-    if (lseek(fd.get(), -sizeof(file_size), SEEK_END) == -1) {
-      return ErrnoError() << "lseek() failed.";
-    }
-    if (read(fd.get(), &file_size, sizeof(file_size)) == -1) {
-      return ErrnoError() << "read() failed";
-    }
-    return betoh32(file_size);
-  }
-  return Error() << "Unknown file type: " << st.st_mode;
-}
-
 }  // namespace
 
 Result<ApexFile> ApexFile::Open(const std::string& path) {
@@ -114,16 +91,11 @@
                         << "I/O error";
   }
 
-  auto size = GetApexFileSize(fd);
-  if (!size.ok()) {
-    return size.error();
-  }
-
   ZipArchiveHandle handle;
   auto handle_guard =
       android::base::make_scope_guard([&handle] { CloseArchive(handle); });
-  int ret = OpenArchiveFdRange(fd.get(), path.c_str(), &handle, *size,
-                               /*offset=*/0, /*assume_ownership=*/false);
+  int ret = OpenArchiveFd(fd.get(), path.c_str(), &handle,
+                          /*assume_ownership=*/false);
   if (ret < 0) {
     return Error() << "Failed to open package " << path << ": "
                    << ErrorCodeString(ret);