diff --git a/fmt b/fmt
index 002bb75..d141cdb 160000
--- a/fmt
+++ b/fmt
@@ -1 +1 @@
-Subproject commit 002bb759ffc2ba03c7167d22cb58291b1b933af4
+Subproject commit d141cdbeb0fb422a3fb7173b285fd38e0d1772dc
diff --git a/fmtlog-inl.h b/fmtlog-inl.h
index b698561..0d51b66 100644
--- a/fmtlog-inl.h
+++ b/fmtlog-inl.h
@@ -293,7 +293,10 @@ class fmtlogDetailT
   }
 
   void flushLogFile() {
-    if (outputFp) fwrite(membuf.data(), 1, membuf.size(), outputFp);
+    if (outputFp) {
+      fwrite(membuf.data(), 1, membuf.size(), outputFp);
+      if (!manageFp) fflush(outputFp);
+    }
     membuf.clear();
     nextFlushTime = (std::numeric_limits<int64_t>::max)();
   }