diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
index e26a3e78a..1836da775 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTitlePane.java
@@ -1016,6 +1016,9 @@ public void mousePressed( MouseEvent e ) {
 			if( window == null )
 				return; // should newer occur
 
+			if( !SwingUtilities.isLeftMouseButton( e ) )
+				return;
+
 			dragOffset = SwingUtilities.convertPoint( FlatTitlePane.this, e.getPoint(), window );
 		}
 
@@ -1030,6 +1033,9 @@ public void mouseDragged( MouseEvent e ) {
 			if( window == null )
 				return; // should newer occur
 
+			if( !SwingUtilities.isLeftMouseButton( e ) )
+				return;
+
 			if( hasNativeCustomDecoration() )
 				return; // do nothing if having native window border
 
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
index 185ecddc3..849c0a359 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatWindowResizer.java
@@ -43,6 +43,7 @@
 import javax.swing.JInternalFrame;
 import javax.swing.JLayeredPane;
 import javax.swing.JRootPane;
+import javax.swing.SwingUtilities;
 import javax.swing.UIManager;
 import com.formdev.flatlaf.util.SystemInfo;
 import com.formdev.flatlaf.util.UIScale;
@@ -521,7 +522,7 @@ public void mouseClicked( MouseEvent e ) {
 
 		@Override
 		public void mousePressed( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			int xOnScreen = e.getXOnScreen();
@@ -550,7 +551,7 @@ public void mousePressed( MouseEvent e ) {
 
 		@Override
 		public void mouseReleased( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			dragLeftOffset = dragRightOffset = dragTopOffset = dragBottomOffset = 0;
@@ -576,7 +577,7 @@ public void mouseMoved( MouseEvent e ) {
 
 		@Override
 		public void mouseDragged( MouseEvent e ) {
-			if( !isWindowResizable() )
+			if( !SwingUtilities.isLeftMouseButton( e ) || !isWindowResizable() )
 				return;
 
 			int xOnScreen = e.getXOnScreen();