diff --git a/rtgui/colorappearance.cc b/rtgui/colorappearance.cc
index 81d0c88b7..e7ddfed21 100644
--- a/rtgui/colorappearance.cc
+++ b/rtgui/colorappearance.cc
@@ -18,7 +18,6 @@
  */
 #include "colorappearance.h"
 #include <cmath>
-#include <iomanip>
 #include "guiutils.h"
 #include "../rtengine/color.h"
 
diff --git a/rtgui/colortoning.cc b/rtgui/colortoning.cc
index a28ff060d..32d232870 100644
--- a/rtgui/colortoning.cc
+++ b/rtgui/colortoning.cc
@@ -2,7 +2,6 @@
  *  This file is part of RawTherapee.
  */
 #include "colortoning.h"
-#include <iomanip>
 #include "mycurve.h"
 
 using namespace rtengine;
diff --git a/rtgui/gradient.cc b/rtgui/gradient.cc
index 0f3d0e28d..b9d8ffe12 100644
--- a/rtgui/gradient.cc
+++ b/rtgui/gradient.cc
@@ -3,7 +3,6 @@
  */
 #include "gradient.h"
 #include "rtimage.h"
-#include <iomanip>
 #include "../rtengine/rt_math.h"
 
 using namespace rtengine;
diff --git a/rtgui/imagearea.cc b/rtgui/imagearea.cc
index 5a9cd3cf9..5a3820350 100644
--- a/rtgui/imagearea.cc
+++ b/rtgui/imagearea.cc
@@ -21,7 +21,6 @@
 #include <cmath>
 #include "options.h"
 #include "multilangmgr.h"
-#include <iomanip>
 #include "cropwindow.h"
 #include "../rtengine/refreshmap.h"
 #include "options.h"
diff --git a/rtgui/pcvignette.cc b/rtgui/pcvignette.cc
index 4ff44397c..67e6ae3c6 100644
--- a/rtgui/pcvignette.cc
+++ b/rtgui/pcvignette.cc
@@ -2,7 +2,6 @@
  *  This file is part of RawTherapee.
  */
 #include "pcvignette.h"
-#include <iomanip>
 
 using namespace rtengine;
 using namespace rtengine::procparams;
diff --git a/rtgui/rgbcurves.cc b/rtgui/rgbcurves.cc
index 97e92b52a..64b4fb93f 100644
--- a/rtgui/rgbcurves.cc
+++ b/rtgui/rgbcurves.cc
@@ -17,7 +17,6 @@
  *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "rgbcurves.h"
-#include <iomanip>
 
 using namespace rtengine;
 using namespace rtengine::procparams;
diff --git a/rtgui/sharpenedge.cc b/rtgui/sharpenedge.cc
index 9c7a528bd..dd9ed27b7 100644
--- a/rtgui/sharpenedge.cc
+++ b/rtgui/sharpenedge.cc
@@ -20,7 +20,6 @@
 #include "guiutils.h"
 #include "../rtengine/safegtk.h"
 #include <sstream>
-#include <iomanip>
 #include <cmath>
 
 using namespace rtengine;
diff --git a/rtgui/sharpenmicro.cc b/rtgui/sharpenmicro.cc
index 21c3d67dd..3577ba217 100644
--- a/rtgui/sharpenmicro.cc
+++ b/rtgui/sharpenmicro.cc
@@ -20,7 +20,6 @@
 #include "guiutils.h"
 #include "../rtengine/safegtk.h"
 #include <sstream>
-#include <iomanip>
 #include <cmath>
 
 using namespace rtengine;
diff --git a/rtgui/vibrance.cc b/rtgui/vibrance.cc
index 97f8a0602..54fcdbd39 100644
--- a/rtgui/vibrance.cc
+++ b/rtgui/vibrance.cc
@@ -19,7 +19,6 @@
 
 #include "vibrance.h"
 #include "../rtengine/color.h"
-#include <iomanip>
 
 using namespace rtengine;
 using namespace rtengine::procparams;
diff --git a/rtgui/vignetting.cc b/rtgui/vignetting.cc
index 4781efd3c..1d3e84018 100644
--- a/rtgui/vignetting.cc
+++ b/rtgui/vignetting.cc
@@ -17,7 +17,6 @@
  *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "vignetting.h"
-#include <iomanip>
 
 using namespace rtengine;
 using namespace rtengine::procparams;