diff --git a/libs/androidfw/ZipUtils.cpp b/libs/androidfw/ZipUtils.cpp
index 5be2105..568e3b6 100644
--- a/libs/androidfw/ZipUtils.cpp
+++ b/libs/androidfw/ZipUtils.cpp
@@ -40,7 +40,7 @@
     explicit FileReader(FILE* fp) : Reader(), mFp(fp), mCurrentOffset(0) {
     }
 
-    bool ReadAtOffset(uint8_t* buf, size_t len, uint32_t offset) const {
+    bool ReadAtOffset(uint8_t* buf, size_t len, off64_t offset) const {
         // Data is usually requested sequentially, so this helps avoid pointless
         // fseeks every time we perform a read. There's an impedence mismatch
         // here because the original API was designed around pread and pwrite.
@@ -63,7 +63,7 @@
 
   private:
     FILE* mFp;
-    mutable uint32_t mCurrentOffset;
+    mutable off64_t mCurrentOffset;
 };
 
 class FdReader : public zip_archive::Reader {
@@ -71,8 +71,8 @@
     explicit FdReader(int fd) : mFd(fd) {
     }
 
-    bool ReadAtOffset(uint8_t* buf, size_t len, uint32_t offset) const {
-      return android::base::ReadFullyAtOffset(mFd, buf, len, static_cast<off_t>(offset));
+    bool ReadAtOffset(uint8_t* buf, size_t len, off64_t offset) const {
+      return android::base::ReadFullyAtOffset(mFd, buf, len, offset);
     }
 
   private:
@@ -86,8 +86,8 @@
         mInputSize(inputSize) {
     }
 
-    bool ReadAtOffset(uint8_t* buf, size_t len, uint32_t offset) const {
-        if (offset + len > mInputSize) {
+    bool ReadAtOffset(uint8_t* buf, size_t len, off64_t offset) const {
+        if (mInputSize < len || offset > mInputSize - len) {
             return false;
         }