--- ./src/OpenFOAM/db/IOstreams/IOstreams/Istream.C.orig	2021-12-01 03:15:50.000000000 +0100
+++ ./src/OpenFOAM/db/IOstreams/IOstreams/Istream.C	2021-12-01 03:15:50.000000000 +0100
@@ -141,7 +141,8 @@
             << "Expected a '" << token::END_LIST
             << "' while reading " << funcName
             << ", found " << delimiter.info()
-            << " at stream position " << tellg(this) << nl
+            << " at stream position "
+            << static_cast<uint64_t>(tellg(this)) << nl
             << exit(FatalIOError);
     }
 
@@ -182,7 +183,8 @@
             << "' or a '" << token::END_BLOCK
             << "' while reading " << funcName
             << ", found " << delimiter.info()
-            << " at stream position " << tellg(this) << nl
+            << " at stream position "
+            << static_cast<uint64_t>(tellg(this)) << nl
             << exit(FatalIOError);
 
         return '\0';