diff --git a/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java b/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
index b91f898d5..056761fb3 100644
--- a/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
+++ b/spine-libgdx/spine-skeletonviewer/src/com/esotericsoftware/spine/SkeletonViewer.java
@@ -378,7 +378,7 @@ public class SkeletonViewer extends ApplicationAdapter {
 		float dpiScale = 1;
 		if (os.contains("Windows")) dpiScale = Toolkit.getDefaultToolkit().getScreenResolution() / 96f;
 		if (os.contains("OS X")) {
-			Configuration.GLFW_CHECK_THREAD0.set(false);
+			Configuration.GLFW_CHECK_THREAD0.set(Boolean.FALSE);
 			Configuration.GLFW_LIBRARY_NAME.set("glfw_async");
 			Object object = Toolkit.getDefaultToolkit().getDesktopProperty("apple.awt.contentScaleFactor");
 			if (object instanceof Float && ((Float)object).intValue() >= 2) dpiScale = 2;