diff --git a/src/java/org/lwjgl/opengl/Window.java b/src/java/org/lwjgl/opengl/Window.java
index 70386be3..fcc6ae60 100644
--- a/src/java/org/lwjgl/opengl/Window.java
+++ b/src/java/org/lwjgl/opengl/Window.java
@@ -361,7 +361,7 @@ public final class Window {
 		nSetVSyncEnabled(sync);
 	}
 
-	private static native boolean nSetVSyncEnabled(boolean sync);
+	private static native void nSetVSyncEnabled(boolean sync);
 
 
 }
diff --git a/src/native/common/org_lwjgl_opengl_Window.h b/src/native/common/org_lwjgl_opengl_Window.h
index 183f56b7..1da9f961 100644
--- a/src/native/common/org_lwjgl_opengl_Window.h
+++ b/src/native/common/org_lwjgl_opengl_Window.h
@@ -122,9 +122,9 @@ JNIEXPORT jboolean JNICALL Java_org_lwjgl_opengl_Window_nIsVSyncEnabled
 /*
  * Class:     org_lwjgl_opengl_Window
  * Method:    nSetVSyncEnabled
- * Signature: (Z)Z
+ * Signature: (Z)V
  */
-JNIEXPORT jboolean JNICALL Java_org_lwjgl_opengl_Window_nSetVSyncEnabled
+JNIEXPORT void JNICALL Java_org_lwjgl_opengl_Window_nSetVSyncEnabled
   (JNIEnv *, jclass, jboolean);
 
 #ifdef __cplusplus