diff --git a/src/Mod/Mesh/Gui/PreCompiled.h b/src/Mod/Mesh/Gui/PreCompiled.h
index 256de1dc58..fafdf068b9 100644
--- a/src/Mod/Mesh/Gui/PreCompiled.h
+++ b/src/Mod/Mesh/Gui/PreCompiled.h
@@ -47,6 +47,7 @@
 
 // STL
 #include <algorithm>
+#include <iomanip>
 #include <list>
 #include <map>
 #include <sstream>
diff --git a/src/Mod/Spreadsheet/App/PreCompiled.h b/src/Mod/Spreadsheet/App/PreCompiled.h
index 54e5f3f6d7..c9b558b336 100644
--- a/src/Mod/Spreadsheet/App/PreCompiled.h
+++ b/src/Mod/Spreadsheet/App/PreCompiled.h
@@ -39,6 +39,7 @@
 // STL
 #include <algorithm>
 #include <deque>
+#include <iomanip>
 #include <map>
 #include <memory>
 #include <set>