diff --git a/src/manufacturingcommands.cpp b/src/manufacturingcommands.cpp
index 6fed043..60199d9 100644
--- a/src/manufacturingcommands.cpp
+++ b/src/manufacturingcommands.cpp
@@ -835,7 +835,7 @@
     }
 
     oEthFile << reinterpret_cast<char*>(buff.data());
-    oEthFile << fflush;
+    oEthFile.flush();
     oEthFile.close();
 
     resetMtmTimer(ctx);