diff --git a/libraries/FSTools/FSTools.cpp b/libraries/FSTools/FSTools.cpp
index 9ef602c88..c18e968b7 100644
--- a/libraries/FSTools/FSTools.cpp
+++ b/libraries/FSTools/FSTools.cpp
@@ -245,6 +245,7 @@ bool FSTools::_copyFS(FS & sourceFS, FS & destFS)
             }
             destFile.close();
             sourceFile.close();
+            yield();
         }
     });