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--- a/src/internfile/mh_mbox.cpp
+++ b/src/internfile/mh_mbox.cpp
@@ -108,8 +108,8 @@
             return -1;
         }
         if (fseeko(fp, cacheoffset(msgnum), SEEK_SET) != 0) {
-            LOGDEB0(("MboxCache::get_offsets: seek %ld errno %d\n",
-                     (long)cacheoffset(msgnum), errno));
+            LOGDEB0(("MboxCache::get_offsets: seek %lld errno %d\n",
+                     cacheoffset(msgnum), errno));
             return -1;
         }
         mbhoff_type offset = -1;