diff --git a/libraries/DataFlash/DataFlash_File.cpp b/libraries/DataFlash/DataFlash_File.cpp
index a844004070..74665d882e 100644
--- a/libraries/DataFlash/DataFlash_File.cpp
+++ b/libraries/DataFlash/DataFlash_File.cpp
@@ -321,8 +321,8 @@ int16_t DataFlash_File::get_log_data(uint16_t log_num, uint16_t page, uint32_t o
       bug. We can remove this once we find the real bug.
     */
     if (ofs / 4096 != (ofs+len) / 4096) {
-        int seek_current = ::lseek(_read_fd, 0, SEEK_CUR);
-        if (seek_current != _read_offset) {
+        off_t seek_current = ::lseek(_read_fd, 0, SEEK_CUR);
+        if (seek_current != (off_t)_read_offset) {
             ::lseek(_read_fd, _read_offset, SEEK_SET);
         }
     }