diff --git a/src/core/layout/qgslayoutitemmapoverview.cpp b/src/core/layout/qgslayoutitemmapoverview.cpp
index 9e03a5ad59f..8f204d922cb 100644
--- a/src/core/layout/qgslayoutitemmapoverview.cpp
+++ b/src/core/layout/qgslayoutitemmapoverview.cpp
@@ -38,11 +38,10 @@ QgsLayoutItemMapOverview::QgsLayoutItemMapOverview( const QString &name, QgsLayo
 void QgsLayoutItemMapOverview::createDefaultFrameSymbol()
 {
   QgsStringMap properties;
-  properties.insert( QStringLiteral( "color" ), QStringLiteral( "255,0,0,255" ) );
+  properties.insert( QStringLiteral( "color" ), QStringLiteral( "255,0,0,75" ) );
   properties.insert( QStringLiteral( "style" ), QStringLiteral( "solid" ) );
   properties.insert( QStringLiteral( "style_border" ), QStringLiteral( "no" ) );
   mFrameSymbol.reset( QgsFillSymbol::createSimple( properties ) );
-  mFrameSymbol->setOpacity( 0.3 );
 }
 
 void QgsLayoutItemMapOverview::draw( QPainter *painter )
diff --git a/tests/src/python/test_qgslayoutmap.py b/tests/src/python/test_qgslayoutmap.py
index 0211864e824..29f71d89434 100644
--- a/tests/src/python/test_qgslayoutmap.py
+++ b/tests/src/python/test_qgslayoutmap.py
@@ -84,6 +84,7 @@ class TestQgsComposerMap(unittest.TestCase):
         overviewMap.setExtent(myRectangle2)
         overviewMap.overview().setFrameMap(self.map)
         checker = QgsLayoutChecker('composermap_overview', self.layout)
+        checker.setColorTolerance(6)
         checker.setControlPathPrefix("composer_mapoverview")
         myTestResult, myMessage = checker.testLayout()
         self.layout.removeLayoutItem(overviewMap)
diff --git a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview/expected_composermap_overview_mask.png b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview/expected_composermap_overview_mask.png
index 1ce1cff1fd0..c55b83b777a 100644
Binary files a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview/expected_composermap_overview_mask.png and b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview/expected_composermap_overview_mask.png differ
diff --git a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_blending/expected_composermap_overview_blending_mask.png b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_blending/expected_composermap_overview_blending_mask.png
index 9719724c2a8..899bf325eb6 100644
Binary files a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_blending/expected_composermap_overview_blending_mask.png and b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_blending/expected_composermap_overview_blending_mask.png differ
diff --git a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_invert/expected_composermap_overview_invert_mask.png b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_invert/expected_composermap_overview_invert_mask.png
index 9f57b2f27a9..7e5d6ea2700 100644
Binary files a/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_invert/expected_composermap_overview_invert_mask.png and b/tests/testdata/control_images/composer_mapoverview/expected_composermap_overview_invert/expected_composermap_overview_invert_mask.png differ