diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 158a60a..54a66e1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,6 +12,7 @@ jobs:
     steps:
       - name: 'Build GLFW from source'
         run: |
+          sudo apt update
           sudo apt install libvulkan-dev doxygen xorg-dev libglu1-mesa-dev gcc-multilib
 
           curl -L https://github.com/glfw/glfw/releases/download/3.3/glfw-3.3.zip -s -o glfw-3.3.zip
diff --git a/kgl-glfw/src/commonMain/kotlin/com/kgl/glfw/Window.kt b/kgl-glfw/src/commonMain/kotlin/com/kgl/glfw/Window.kt
index 79359bb..d6a86ab 100644
--- a/kgl-glfw/src/commonMain/kotlin/com/kgl/glfw/Window.kt
+++ b/kgl-glfw/src/commonMain/kotlin/com/kgl/glfw/Window.kt
@@ -64,7 +64,7 @@ expect class Window(
 	var rawMouseButtonEnabled: Boolean
 
 	fun swapBuffers()
-	fun setMonitor(monitor: Monitor, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int)
+	fun setMonitor(monitor: Monitor?, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int)
 	fun setTitle(title: String)
 	fun setSizeLimits(minWidth: Int, minHeight: Int, maxWidth: Int, maxHeight: Int)
 	fun setAspectRatio(number: Int, denom: Int)
diff --git a/kgl-glfw/src/jvmMain/kotlin/com/kgl/glfw/Window.kt b/kgl-glfw/src/jvmMain/kotlin/com/kgl/glfw/Window.kt
index 49cfba2..bb2a248 100644
--- a/kgl-glfw/src/jvmMain/kotlin/com/kgl/glfw/Window.kt
+++ b/kgl-glfw/src/jvmMain/kotlin/com/kgl/glfw/Window.kt
@@ -249,8 +249,8 @@ actual class Window private constructor(val ptr: Long) : Closeable {
 			glfwSetInputMode(ptr, GLFW_RAW_MOUSE_MOTION, if (value) GLFW_TRUE else GLFW_FALSE)
 		}
 
-	actual fun setMonitor(monitor: Monitor, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int) {
-		glfwSetWindowMonitor(ptr, monitor.ptr, xpos, ypos, width, height, refreshRate)
+	actual fun setMonitor(monitor: Monitor?, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int) {
+		glfwSetWindowMonitor(ptr, monitor?.ptr ?: 0L, xpos, ypos, width, height, refreshRate)
 	}
 
 	actual fun setTitle(title: String) {
diff --git a/kgl-glfw/src/nativeMain/kotlin/com/kgl/glfw/Window.kt b/kgl-glfw/src/nativeMain/kotlin/com/kgl/glfw/Window.kt
index b11f11f..fc47535 100644
--- a/kgl-glfw/src/nativeMain/kotlin/com/kgl/glfw/Window.kt
+++ b/kgl-glfw/src/nativeMain/kotlin/com/kgl/glfw/Window.kt
@@ -279,8 +279,8 @@ actual class Window private constructor(val ptr: CPointer<GLFWwindow>) : Closeab
 		}
 
 
-	actual fun setMonitor(monitor: Monitor, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int) {
-		glfwSetWindowMonitor(ptr, monitor.ptr, xpos, ypos, width, height, refreshRate)
+	actual fun setMonitor(monitor: Monitor?, xpos: Int, ypos: Int, width: Int, height: Int, refreshRate: Int) {
+		glfwSetWindowMonitor(ptr, monitor?.ptr, xpos, ypos, width, height, refreshRate)
 	}
 
 	actual fun setTitle(title: String) {