diff --git a/Cargo.lock b/Cargo.lock
index cbdf391..7a9d0d0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -452,7 +452,7 @@ checksum = "69cdb34c158ceb288df11e18b4bd39de994f6657d83847bdffdbd7f346754b0f"
 
 [[package]]
 name = "ranma-cli"
-version = "0.1.6"
+version = "0.1.8"
 dependencies = [
  "argh",
  "libc",
@@ -462,7 +462,7 @@ dependencies = [
 
 [[package]]
 name = "ranma-core"
-version = "0.1.6"
+version = "0.1.8"
 dependencies = [
  "parking_lot",
  "serde",
@@ -737,7 +737,7 @@ dependencies = [
 
 [[package]]
 name = "uniffi-bindgen"
-version = "0.1.6"
+version = "0.1.8"
 dependencies = [
  "uniffi",
 ]
diff --git a/app/Sources/RanmaAppDelegate.swift b/app/Sources/RanmaAppDelegate.swift
index 389bf6d..e2276ef 100644
--- a/app/Sources/RanmaAppDelegate.swift
+++ b/app/Sources/RanmaAppDelegate.swift
@@ -50,7 +50,7 @@ class RanmaAppDelegate: NSObject, NSApplicationDelegate {
             DisplayInfo(
                 id: screen.displayID,
                 name: screen.localizedName,
-                isMain: screen == NSScreen.main
+                isMain: screen.displayID == CGMainDisplayID()
             )
         }
         setDisplays(displays: displays)