diff --git a/org.eclipse.jface.text.tests/src/org/eclipse/jface/text/tests/contentassist/AsyncContentAssistTest.java b/org.eclipse.jface.text.tests/src/org/eclipse/jface/text/tests/contentassist/AsyncContentAssistTest.java
index 751c1ffb9..83f9c28a5 100644
--- a/org.eclipse.jface.text.tests/src/org/eclipse/jface/text/tests/contentassist/AsyncContentAssistTest.java
+++ b/org.eclipse.jface.text.tests/src/org/eclipse/jface/text/tests/contentassist/AsyncContentAssistTest.java
@@ -153,14 +153,19 @@ public void testCompleteActivationChar() {
 		final Set<Shell> beforeShells= Arrays.stream(display.getShells()).filter(Shell::isVisible).collect(Collectors.toSet());
 		Event keyEvent= new Event();
 		Control control= viewer.getTextWidget();
-		display.timerExec(200, new Runnable() {
+		display.timerExec(0, new Runnable() {
 			@Override
 			public void run() {
 				if (control.isDisposed()) {
 					// https://github.com/eclipse-platform/eclipse.platform.text/issues/75#issuecomment-1263429480
 					return; // do not fail other unit tests
 				}
-				control.forceFocus();
+				control.getShell().forceActive();
+				if (!control.forceFocus()) {
+					display.timerExec(200, this);
+					System.out.println("no focus");
+					return;
+				}
 				keyEvent.widget= control;
 				keyEvent.type= SWT.KeyDown;
 				keyEvent.character= 'b';
@@ -170,6 +175,7 @@ public void run() {
 				control.getDisplay().post(keyEvent);
 				DisplayHelper.driveEventQueue(control.getDisplay());
 				if (!document.get().startsWith("bb")) {
+					System.out.println("character b not added to control");
 					display.timerExec(200, this);
 				}
 			}
@@ -185,7 +191,7 @@ protected boolean condition() {
 				}
 				return false;
 			}
-		}.waitForCondition(display, 4000));
+		}.waitForCondition(display, 40000));
 	}
 
 	private static Table findCompletionSelectionControl(Widget control) {