diff --git a/util/posix_logger.h b/util/posix_logger.h
index 6aba769f1..e4a2c8456 100644
--- a/util/posix_logger.h
+++ b/util/posix_logger.h
@@ -123,14 +123,15 @@ class PosixLogger : public Logger {
       // space, pre-allocate more space to avoid overly large
       // allocations from filesystem allocsize options.
       const size_t log_size = log_size_;
-      const int last_allocation_chunk =
+      const size_t last_allocation_chunk =
         ((kDebugLogChunkSize - 1 + log_size) / kDebugLogChunkSize);
-      const int desired_allocation_chunk =
+      const size_t desired_allocation_chunk =
         ((kDebugLogChunkSize - 1 + log_size + write_size) /
            kDebugLogChunkSize);
       if (last_allocation_chunk != desired_allocation_chunk) {
-        fallocate(fd_, FALLOC_FL_KEEP_SIZE, 0,
-                  desired_allocation_chunk * kDebugLogChunkSize);
+        fallocate(
+            fd_, FALLOC_FL_KEEP_SIZE, 0,
+            static_cast<off_t>(desired_allocation_chunk * kDebugLogChunkSize));
       }
 #endif