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--- a/src/internfile/internfile.cpp
+++ b/src/internfile/internfile.cpp
@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <errno.h>
+#include <stdint.h>
 #include "safefcntl.h"
 #include <sys/types.h>
 #include "safesysstat.h"
@@ -175,7 +176,7 @@
             l_mime = *imime;
     }
 
-    off_t docsize = stp->st_size;
+    int64_t docsize = stp->st_size;
 
     if (!l_mime.empty()) {
 	// Has mime: check for a compressed file. If so, create a