diff --git a/src/engine.h b/src/engine.h
index 4059766320e04285ef2ed1fc1b287f4871f08328..e9ea3c35a4523b5780cb3d1b0c134950265aa85d 100644
--- a/src/engine.h
+++ b/src/engine.h
@@ -323,7 +323,7 @@ struct engine {
   size_t logger_time_offset;
 
   /* Size of the dump file */
-  int logger_size;
+  size_t logger_size;
 #endif
 
   /* Need to dump a snapshot ? */