diff --git a/src/common/gui/CModulationSourceButton.cpp b/src/common/gui/CModulationSourceButton.cpp
index 4c33dbcc3f9..17bc5b7a67f 100644
--- a/src/common/gui/CModulationSourceButton.cpp
+++ b/src/common/gui/CModulationSourceButton.cpp
@@ -257,7 +257,7 @@ CMouseEventResult CModulationSourceButton::onMouseDown(CPoint& where, const CBut
    }
 
    if (listener &&
-       buttons & (kAlt | kRButton | kMButton | kShift | kControl | kApple | kDoubleClick))
+       buttons & (kAlt | kRButton | kMButton | kButton4 | kButton5 | kShift | kControl | kApple | kDoubleClick))
    {
       if (listener->controlModifierClicked(this, buttons) != 0)
          return kMouseDownEventHandledButDontNeedMovedOrUpEvents;
diff --git a/src/common/gui/CSurgeSlider.cpp b/src/common/gui/CSurgeSlider.cpp
index f063ed3c569..6d9ac466d7e 100644
--- a/src/common/gui/CSurgeSlider.cpp
+++ b/src/common/gui/CSurgeSlider.cpp
@@ -346,7 +346,7 @@ CMouseEventResult CSurgeSlider::onMouseDown(CPoint& where, const CButtonState& b
    }
 
    if (listener &&
-       buttons & (kAlt | kRButton | kMButton | kShift | kControl | kApple | kDoubleClick))
+       buttons & (kAlt | kRButton | kMButton | kButton4 | kButton5 | kShift | kControl | kApple | kDoubleClick))
    {
       if (listener->controlModifierClicked(this, buttons) != 0)
          return kMouseEventHandled;