diff --git a/rtengine/EdgePreservingDecomposition.cc b/rtengine/EdgePreservingDecomposition.cc
index c8ba8f9d8..21abe733c 100644
--- a/rtengine/EdgePreservingDecomposition.cc
+++ b/rtengine/EdgePreservingDecomposition.cc
@@ -554,7 +554,7 @@ bool MultiDiagonalSymmetricMatrix::CreateIncompleteCholeskyFactorization(int Max
     return true;
 }
 
-void MultiDiagonalSymmetricMatrix::KillIncompleteCholeskyFactorization(void)
+void MultiDiagonalSymmetricMatrix::KillIncompleteCholeskyFactorization()
 {
     delete IncompleteCholeskyFactorization;
 }
diff --git a/rtengine/camconst.cc b/rtengine/camconst.cc
index 3e7ad6202..91d4e6c8b 100644
--- a/rtengine/camconst.cc
+++ b/rtengine/camconst.cc
@@ -321,7 +321,7 @@ parse_error:
 }
 
 bool
-CameraConst::has_dcrawMatrix(void)
+CameraConst::has_dcrawMatrix()
 {
     return dcraw_matrix[0] != 0;
 }
@@ -339,7 +339,7 @@ CameraConst::update_dcrawMatrix(const short *other)
 }
 
 const short *
-CameraConst::get_dcrawMatrix(void)
+CameraConst::get_dcrawMatrix()
 {
     if (!has_dcrawMatrix()) {
         return nullptr;
@@ -349,7 +349,7 @@ CameraConst::get_dcrawMatrix(void)
 }
 
 bool
-CameraConst::has_rawCrop(void)
+CameraConst::has_rawCrop()
 {
     return raw_crop[0] != 0 || raw_crop[1] != 0 || raw_crop[2] != 0 || raw_crop[3] != 0;
 }
@@ -698,7 +698,7 @@ void CameraConstantsStore::init(Glib::ustring baseDir, Glib::ustring userSetting
 }
 
 CameraConstantsStore *
-CameraConstantsStore::getInstance(void)
+CameraConstantsStore::getInstance()
 {
     static CameraConstantsStore instance_;
     return &instance_;
diff --git a/rtengine/curves.cc b/rtengine/curves.cc
index 9b68cc9ee..2cd56dbb9 100644
--- a/rtengine/curves.cc
+++ b/rtengine/curves.cc
@@ -1775,7 +1775,7 @@ float PerceptualToneCurve::get_curve_val(float x, float range[2], float lut[], s
 }
 
 // calculate a single value that represents the contrast of the tone curve
-float PerceptualToneCurve::calculateToneCurveContrastValue(void) const
+float PerceptualToneCurve::calculateToneCurveContrastValue() const
 {
 
     // find linear y = k*x the best approximates the curve, which is the linear scaling/exposure component that does not contribute any contrast
diff --git a/rtgui/previewloader.cc b/rtgui/previewloader.cc
index 82db6b9dc..4bdffc512 100644
--- a/rtgui/previewloader.cc
+++ b/rtgui/previewloader.cc
@@ -167,7 +167,7 @@ PreviewLoader::PreviewLoader():
 {
 }
 
-PreviewLoader* PreviewLoader::getInstance(void)
+PreviewLoader* PreviewLoader::getInstance()
 {
     static PreviewLoader instance_;
     return &instance_;
@@ -191,7 +191,7 @@ void PreviewLoader::add(int dir_id, const Glib::ustring& dir_entry, PreviewLoade
     }
 }
 
-void PreviewLoader::removeAllJobs(void)
+void PreviewLoader::removeAllJobs()
 {
     DEBUG("stop %d", impl_->nConcurrentThreads);
     MyMutex::MyLock lock(impl_->mutex_);
diff --git a/rtgui/thumbimageupdater.cc b/rtgui/thumbimageupdater.cc
index 0f903dcd8..7b3218a3e 100644
--- a/rtgui/thumbimageupdater.cc
+++ b/rtgui/thumbimageupdater.cc
@@ -190,7 +190,7 @@ public:
 };
 
 ThumbImageUpdater*
-ThumbImageUpdater::getInstance(void)
+ThumbImageUpdater::getInstance()
 {
     static ThumbImageUpdater instance_;
     return &instance_;
@@ -272,7 +272,7 @@ ThumbImageUpdater::removeJobs(ThumbImageUpdateListener* listener)
 }
 
 void
-ThumbImageUpdater::removeAllJobs(void)
+ThumbImageUpdater::removeAllJobs()
 {
     DEBUG("stop");