diff --git a/CHANGELOG.md b/CHANGELOG.md
index ffa4d9e9..20df43d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ FlatLaf Change Log
 - Linux: Fixed scaling if `GDK_SCALE` environment variable is set or if running
   on JetBrains Runtime. (issue #69)
 - Tree: Fixed repainting wide selection on focus gained/lost.
+- ComboBox: No longer ignore `JComboBox.prototypeDisplayValue` when computing
+  popup width. (issue #80)
 - Support changing default font used for all components with automatic scaling
   UI if using larger font. Use `UIManager.put( "defaultFont", myFont );`
 - No longer use system property `sun.java2d.uiScale`. (Java 8 only)
diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java
index 49143807..c7730e34 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatComboBoxUI.java
@@ -480,13 +480,8 @@ public class FlatComboBoxUI
 
 		@Override
 		protected Rectangle computePopupBounds( int px, int py, int pw, int ph ) {
-			// get maximum display size of all items, ignoring prototype value
-			Object prototype = comboBox.getPrototypeDisplayValue();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( null );
+			// get maximum display size of all items
 			Dimension displaySize = getDisplaySize();
-			if( prototype != null )
-				comboBox.setPrototypeDisplayValue( prototype );
 
 			// make popup wider if necessary
 			if( displaySize.width > pw ) {
diff --git a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.java b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.java
index 2e73567c..5fea98b5 100644
--- a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.java
+++ b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.java
@@ -310,14 +310,13 @@ class BasicComponentsPanel
 		add(comboBox4, "cell 4 4,growx");
 
 		//---- comboBox5 ----
-		comboBox5.setPrototypeDisplayValue("12345");
 		comboBox5.setModel(new DefaultComboBoxModel<>(new String[] {
 			"wide popup if text is longer",
 			"aa",
 			"bbb",
 			"cccc"
 		}));
-		add(comboBox5, "cell 5 4,growx");
+		add(comboBox5, "cell 5 4,growx,wmax 100");
 
 		//---- spinnerLabel ----
 		spinnerLabel.setText("JSpinner:");
diff --git a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.jfd b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.jfd
index 81c6bb83..cf19d4ca 100644
--- a/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.jfd
+++ b/flatlaf-demo/src/main/java/com/formdev/flatlaf/demo/BasicComponentsPanel.jfd
@@ -242,7 +242,6 @@ new FormModel {
 			} )
 			add( new FormComponent( "javax.swing.JComboBox" ) {
 				name: "comboBox5"
-				"prototypeDisplayValue": "12345"
 				"model": new javax.swing.DefaultComboBoxModel {
 					selectedItem: "wide popup if text is longer"
 					addElement( "wide popup if text is longer" )
@@ -251,7 +250,7 @@ new FormModel {
 					addElement( "cccc" )
 				}
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 5 4,growx"
+				"value": "cell 5 4,growx,wmax 100"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "spinnerLabel"
diff --git a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.java b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.java
index 69847c07..c7767e1d 100644
--- a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.java
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.java
@@ -513,14 +513,13 @@ public class FlatComponentsTest
 		add(comboBox4, "cell 4 5,growx");
 
 		//---- comboBox5 ----
-		comboBox5.setPrototypeDisplayValue("12345");
 		comboBox5.setModel(new DefaultComboBoxModel<>(new String[] {
 			"wide popup if text is longer",
 			"aa",
 			"bbb",
 			"cccc"
 		}));
-		add(comboBox5, "cell 5 5,growx");
+		add(comboBox5, "cell 5 5,growx,wmax 100");
 
 		//---- spinnerLabel ----
 		spinnerLabel.setText("JSpinner:");
diff --git a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.jfd b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.jfd
index 28154222..1daebf5f 100644
--- a/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.jfd
+++ b/flatlaf-testing/src/main/java/com/formdev/flatlaf/testing/FlatComponentsTest.jfd
@@ -373,7 +373,6 @@ new FormModel {
 			} )
 			add( new FormComponent( "javax.swing.JComboBox" ) {
 				name: "comboBox5"
-				"prototypeDisplayValue": "12345"
 				"model": new javax.swing.DefaultComboBoxModel {
 					selectedItem: "wide popup if text is longer"
 					addElement( "wide popup if text is longer" )
@@ -382,7 +381,7 @@ new FormModel {
 					addElement( "cccc" )
 				}
 			}, new FormLayoutConstraints( class net.miginfocom.layout.CC ) {
-				"value": "cell 5 5,growx"
+				"value": "cell 5 5,growx,wmax 100"
 			} )
 			add( new FormComponent( "javax.swing.JLabel" ) {
 				name: "spinnerLabel"