diff --git a/src/protocols/rdp/rdp_fs.c b/src/protocols/rdp/rdp_fs.c
index d32da681..911d663f 100644
--- a/src/protocols/rdp/rdp_fs.c
+++ b/src/protocols/rdp/rdp_fs.c
@@ -426,7 +426,7 @@ int guac_rdp_fs_read(guac_rdp_fs* fs, int file_id, uint64_t offset,
 
 }
 
-int guac_rdp_fs_write(guac_rdp_fs* fs, int file_id, int offset,
+int guac_rdp_fs_write(guac_rdp_fs* fs, int file_id, uint64_t offset,
         void* buffer, int length) {
 
     int bytes_written;
diff --git a/src/protocols/rdp/rdp_fs.h b/src/protocols/rdp/rdp_fs.h
index 8148725e..8a754fbb 100644
--- a/src/protocols/rdp/rdp_fs.h
+++ b/src/protocols/rdp/rdp_fs.h
@@ -515,7 +515,7 @@ int guac_rdp_fs_read(guac_rdp_fs* fs, int file_id, uint64_t offset,
  *     occurs. All error codes are negative values and correspond to
  *     GUAC_RDP_FS constants, such as GUAC_RDP_FS_ENOENT.
  */
-int guac_rdp_fs_write(guac_rdp_fs* fs, int file_id, int offset,
+int guac_rdp_fs_write(guac_rdp_fs* fs, int file_id, uint64_t offset,
         void* buffer, int length);
 
 /**
diff --git a/src/protocols/rdp/rdp_stream.h b/src/protocols/rdp/rdp_stream.h
index c9c3838e..deec4f9a 100644
--- a/src/protocols/rdp/rdp_stream.h
+++ b/src/protocols/rdp/rdp_stream.h
@@ -57,7 +57,7 @@ typedef struct guac_rdp_upload_status {
      * The overall offset within the file that the next write should
      * occur at.
      */
-    int offset;
+    uint64_t offset;
 
     /**
      * The ID of the file being written to.