--- ./src/OpenFOAM/db/IOstreams/IOstreams/Istream.C.orig	2022-02-08 17:25:26.649794083 +0100
+++ ./src/OpenFOAM/db/IOstreams/IOstreams/Istream.C	2022-02-08 17:28:57.869549414 +0100
@@ -137,7 +137,7 @@
             << "Expected a '" << token::END_LIST
             << "' while reading " << funcName
             << ", found " << delimiter.info()
-            << " at stream position " << stream_tellg(this) << nl
+            << " at stream position " << static_cast<uint64_t>(stream_tellg(this)) << nl
             << exit(FatalIOError);
     }
 
@@ -178,7 +178,7 @@
             << "' or a '" << token::END_BLOCK
             << "' while reading " << funcName
             << ", found " << delimiter.info()
-            << " at stream position " << stream_tellg(this) << nl
+            << " at stream position " << static_cast<uint64_t>(stream_tellg(this)) << nl
             << exit(FatalIOError);
 
         return '\0';