diff --git a/platform/darwin/tray.m b/platform/darwin/tray.m
index c4112df..0c3e21c 100644
--- a/platform/darwin/tray.m
+++ b/platform/darwin/tray.m
@@ -1,6 +1,7 @@
 #import <Cocoa/Cocoa.h>
 
 NSMenu * appMenu;
+NSStatusItem * appStatusItem;
 char * clipboardString;
 
 extern void tray_callback(int itemId);
@@ -8,6 +9,8 @@
 extern void notification_callback();
 extern struct image invert_png_image(struct image img);
 
+void set_status_item_icon(struct image img);
+
 @interface ManageHandler : NSObject<NSUserNotificationCenterDelegate>
 - (void)manage:(id)sender;
 - (BOOL)validateMenuItem:(NSMenuItem *)menuItem;
@@ -112,6 +115,16 @@ int init(const char * title, struct image img) {
             [self userNotificationCenter: nil didActivateNotification: launchNotification];
     }*/
 
+    appStatusItem = [[[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength] retain];
+    [appStatusItem setMenu:appMenu];
+    [appStatusItem setHighlightMode:YES];
+    [appStatusItem setToolTip:[NSString stringWithUTF8String:title]];
+    set_status_item_icon(img);
+
+    return 0;
+}
+
+void set_status_item_icon(struct image img) {
     NSSize iconSize = NSMakeSize(16, 16);
     NSImage * icon = [[NSImage alloc] initWithSize:iconSize];
     NSData * iconData = [NSData dataWithBytes:img.bytes length:img.length];
@@ -123,14 +136,8 @@ int init(const char * title, struct image img) {
     NSData * icon2Data = [NSData dataWithBytes:img.bytes length:img.length];
     [icon2 addRepresentation:[NSBitmapImageRep imageRepWithData:icon2Data]];
 
-    NSStatusItem * statusItem = [[[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength] retain];
-    [statusItem setMenu:appMenu];
-    [statusItem setImage:icon];
-    [statusItem setAlternateImage:icon2];
-    [statusItem setHighlightMode:YES];
-    [statusItem setToolTip:[NSString stringWithUTF8String:title]];
-
-    return 0;
+    [appStatusItem setImage:icon];
+    [appStatusItem setAlternateImage:icon2];
 }
 
 void set_clipboard_string(const char * string) {
diff --git a/platform/linux/tray.c b/platform/linux/tray.c
index 4e9f286..f35d789 100644
--- a/platform/linux/tray.c
+++ b/platform/linux/tray.c
@@ -34,6 +34,9 @@ void display_notification(int id, const char* title, const char* body, struct im
 // TODO: Implement.
 void clear_menu_items() {}
 
+// TODO: Implement.
+void set_status_item_icon(struct image img) {}
+
 // TODO: Implement.
 struct clipboard_content get_clipboard_content()
 {
diff --git a/platform/windows/tray.c b/platform/windows/tray.c
index 104728a..fb3e920 100644
--- a/platform/windows/tray.c
+++ b/platform/windows/tray.c
@@ -225,3 +225,7 @@ struct clipboard_content get_clipboard_content() {
 void display_notification(int notificationId, const char * title, const char * body, struct image img, double timeout) {
     // TODO: Implement.
 }
+
+// TODO: Implement.
+void set_status_item_icon(struct image img) {}
+
diff --git a/trayhost.go b/trayhost.go
index 928be1a..e94fe94 100644
--- a/trayhost.go
+++ b/trayhost.go
@@ -56,6 +56,13 @@ func Initialize(title string, imageData []byte, items []MenuItem) {
 	}
 }
 
+// SetStatusIcon replaces the icon image data.
+func SetStatusIcon(imageData []byte) {
+	img, freeImg := create_image(Image{Kind: "png", Bytes: imageData})
+	defer freeImg()
+	C.set_status_item_icon(img)
+}
+
 // EnterLoop enters main loop.
 func EnterLoop() {
 	C.native_loop()
diff --git a/trayhost_exports.go b/trayhost_exports.go
index ef195a2..0cbf0a1 100644
--- a/trayhost_exports.go
+++ b/trayhost_exports.go
@@ -92,7 +92,10 @@ func invertPngImage(imageData []byte) []byte {
 		panic(err)
 	}
 
-	invertImageNrgba(m.(*image.NRGBA))
+	switch m.(type) {
+	case *image.NRGBA:
+		invertImageNrgba(m.(*image.NRGBA))
+	}
 
 	var buf bytes.Buffer
 	err = png.Encode(&buf, m)