diff --git a/libc/include/android/dlext.h b/libc/include/android/dlext.h
index 5c3a206..f81ec70 100644
--- a/libc/include/android/dlext.h
+++ b/libc/include/android/dlext.h
@@ -54,12 +54,19 @@
    */
   ANDROID_DLEXT_USE_LIBRARY_FD        = 0x10,
 
+  /* When opening library using library_fd read it starting with library_offset
+   * This flag is only valid when ANDROID_DLEXT_USE_LIBRARY_FD is set.
+   */
+
+  ANDROID_DLEXT_USE_LIBRARY_OFFSET    = 0x20,
+
   /* Mask of valid bits */
   ANDROID_DLEXT_VALID_FLAG_BITS       = ANDROID_DLEXT_RESERVED_ADDRESS |
                                         ANDROID_DLEXT_RESERVED_ADDRESS_HINT |
                                         ANDROID_DLEXT_WRITE_RELRO |
                                         ANDROID_DLEXT_USE_RELRO |
-                                        ANDROID_DLEXT_USE_LIBRARY_FD,
+                                        ANDROID_DLEXT_USE_LIBRARY_FD |
+                                        ANDROID_DLEXT_USE_LIBRARY_OFFSET,
 };
 
 typedef struct {
@@ -68,6 +75,7 @@
   size_t  reserved_size;
   int     relro_fd;
   int     library_fd;
+  off64_t library_offset;
 } android_dlextinfo;
 
 extern void* android_dlopen_ext(const char* filename, int flag, const android_dlextinfo* extinfo);