diff --git a/src/macosx/classes/com/apple/laf/AquaInternalFrameUI.java b/src/macosx/classes/com/apple/laf/AquaInternalFrameUI.java
index ea09bf8a9b7a89974224f8bbb9df94a029e558ba..fca44784938a1f3c416237c51920cd23e9140d94 100644
--- a/src/macosx/classes/com/apple/laf/AquaInternalFrameUI.java
+++ b/src/macosx/classes/com/apple/laf/AquaInternalFrameUI.java
@@ -257,7 +257,7 @@ public class AquaInternalFrameUI extends BasicInternalFrameUI implements SwingCo
     }
 
     public Dimension getPreferredSize(JComponent x) {
-        Dimension preferredSize = super.getMinimumSize(x);
+        Dimension preferredSize = super.getPreferredSize(x);
         Dimension minimumSize = frame.getMinimumSize();
         if (preferredSize.width < minimumSize.width) {
             preferredSize.width = minimumSize.width;