diff --git a/build.spec b/build.spec
index 3ffc9b0..820ccd6 100644
--- a/build.spec
+++ b/build.spec
@@ -1,7 +1,11 @@
 # -*- mode: python -*-
 
+import platform
+
 block_cipher = None
 
+icon_filename = 'icon.icns' if platform.system() == 'Darwin' else 'icon.ico'
+
 a = Analysis(['examdownloader-gui.py'],
              pathex=['.'],
              binaries=None,
@@ -28,7 +32,7 @@ exe = EXE(pyz,
           strip=False,
           upx=True,
           console=False,
-          icon='icon.icns')
+          icon=icon_filename)
 
 app = BUNDLE(exe,
              name='NUS Exams Paper Downloader.app',
diff --git a/icon.ico b/icon.ico
new file mode 100644
index 0000000..37f1300
Binary files /dev/null and b/icon.ico differ