diff --git a/src/libs/utils/detailswidget.cpp b/src/libs/utils/detailswidget.cpp
index ff03150af4d..e0e4139f1d1 100644
--- a/src/libs/utils/detailswidget.cpp
+++ b/src/libs/utils/detailswidget.cpp
@@ -189,9 +189,9 @@ void DetailsWidgetPrivate::changeHoverState(bool hovered)
     if (!m_toolWidget)
         return;
     if (HostOsInfo::isMacHost())
-        m_toolWidget->setOpacity(hovered ? 1.0 : 0);
+        m_toolWidget->setOpacity(hovered ? .999 : 0);
     else
-        m_toolWidget->fadeTo(hovered ? 1.0 : 0);
+        m_toolWidget->fadeTo(hovered ? .999 : 0);
     m_hovered = hovered;
 }
 
@@ -387,7 +387,7 @@ void DetailsWidget::setToolWidget(FadingPanel *widget)
     d->m_grid->addWidget(d->m_toolWidget, 0, 1, 1, 1, Qt::AlignRight);
 
     if (HostOsInfo::isMacHost())
-        d->m_toolWidget->setOpacity(1.0);
+        d->m_toolWidget->setOpacity(.999);
     d->changeHoverState(d->m_hovered);
 }
 
diff --git a/src/plugins/coreplugin/progressmanager/progressmanager.cpp b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
index e583aa0c791..108899bc765 100644
--- a/src/plugins/coreplugin/progressmanager/progressmanager.cpp
+++ b/src/plugins/coreplugin/progressmanager/progressmanager.cpp
@@ -273,7 +273,7 @@ ProgressManagerPrivate::ProgressManagerPrivate()
     m_progressViewPinned(false),
     m_hovered(false)
 {
-    m_opacityEffect->setOpacity(1);
+    m_opacityEffect->setOpacity(.999);
     m_instance = this;
     m_progressView = new ProgressView;
     // withDelay, so the statusBarWidget has the chance to get the enter event
@@ -543,7 +543,7 @@ void ProgressManagerPrivate::stopFadeOfSummaryProgress()
 {
     if (m_opacityAnimation) {
         m_opacityAnimation->stop();
-        m_opacityEffect->setOpacity(1.);
+        m_opacityEffect->setOpacity(.999);
         delete m_opacityAnimation;
     }
 }
@@ -689,7 +689,7 @@ void ProgressManagerPrivate::updateStatusDetailsWidget()
 void ProgressManagerPrivate::summaryProgressFinishedFading()
 {
     m_summaryProgressWidget->setVisible(false);
-    m_opacityEffect->setOpacity(1.);
+    m_opacityEffect->setOpacity(.999);
 }
 
 void ProgressManagerPrivate::progressDetailsToggled(bool checked)
diff --git a/src/plugins/projectexplorer/buildstepspage.cpp b/src/plugins/projectexplorer/buildstepspage.cpp
index 64610a7b3ec..7e17db63e13 100644
--- a/src/plugins/projectexplorer/buildstepspage.cpp
+++ b/src/plugins/projectexplorer/buildstepspage.cpp
@@ -136,9 +136,9 @@ void ToolWidget::setBuildStepEnabled(bool b)
             m_firstWidget->fadeTo(m_targetOpacity);
     } else {
         if (HostOsInfo::isMacHost())
-            m_firstWidget->setOpacity(1.0);
+            m_firstWidget->setOpacity(.999);
         else
-            m_firstWidget->fadeTo(1.0);
+            m_firstWidget->fadeTo(.999);
     }
     m_disableButton->setChecked(!b);
 }