diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
index b64af181..8d6a1037 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
@@ -70,6 +70,8 @@ public class CtlCandidateTDK: CtlCandidate, NSWindowDelegate {
     panel.level = NSWindow.Level(Int(max(CGShieldingWindowLevel(), kCGPopUpMenuWindowLevel)) + 2)
     panel.hasShadow = true
     panel.backgroundColor = NSColor.clear
+    panel.isMovable = true
+    panel.isMovableByWindowBackground = true
     contentRect.origin = NSPoint.zero
 
     super.init(layout)