diff --git a/src/video/cocoa/cocoa_v.h b/src/video/cocoa/cocoa_v.h
index 06bbbfdb2a..e350f0a060 100644
--- a/src/video/cocoa/cocoa_v.h
+++ b/src/video/cocoa/cocoa_v.h
@@ -50,6 +50,11 @@ public:
 	 */
 	/* virtual */ bool AfterBlitterChange();
 
+	/**
+	 * An edit box lost the input focus. Abort character compositing if necessary.
+	 */
+	/* virtual */ void EditBoxLostFocus();
+
 	/** Return driver name
 	 * @return driver name
 	 */
diff --git a/src/video/cocoa/cocoa_v.mm b/src/video/cocoa/cocoa_v.mm
index 8e7b7824ec..11ba8ab849 100644
--- a/src/video/cocoa/cocoa_v.mm
+++ b/src/video/cocoa/cocoa_v.mm
@@ -494,6 +494,20 @@ bool VideoDriver_Cocoa::AfterBlitterChange()
 	return this->ChangeResolution(_screen.width, _screen.height);
 }
 
+/**
+ * An edit box lost the input focus. Abort character compositing if necessary.
+ */
+void VideoDriver_Cocoa::EditBoxLostFocus()
+{
+	if (_cocoa_subdriver != NULL) {
+		if ([ _cocoa_subdriver->cocoaview respondsToSelector:@selector(inputContext) ]) {
+			[ [ _cocoa_subdriver->cocoaview performSelector:@selector(inputContext) ] performSelector:@selector(discardMarkedText) ];
+		} else {
+			[ [ NSInputManager currentInputManager ] markedTextAbandoned:_cocoa_subdriver->cocoaview ];
+		}
+	}
+}
+
 /**
  * Catch asserts prior to initialization of the videodriver.
  *