2 files changed, 2 insertions, 2 deletions
diff --git a/demos/opengl/CMakeLists.txt b/demos/opengl/CMakeLists.txt
index 968ed6cb4..b98a30c01 100644
--- a/demos/opengl/CMakeLists.txt
+++ b/demos/opengl/CMakeLists.txt
@@ -1,4 +1,3 @@
-
 find_package(Qt4 REQUIRED)
 find_package(OpenGL REQUIRED)
 
@@ -14,6 +13,7 @@ set(quaternion_demo_SRCS  gpuhelper.cpp icosphere.cpp camera.cpp trackball.cpp q
 qt4_automoc(${quaternion_demo_SRCS})
 
 add_executable(quaternion_demo ${quaternion_demo_SRCS})
+add_dependencies(demos quaternion_demo)
 
 target_link_libraries(quaternion_demo
   ${QT_QTCORE_LIBRARY}    ${QT_QTGUI_LIBRARY}
diff --git a/demos/opengl/camera.cpp b/demos/opengl/camera.cpp
index a785caf78..26598522e 100644
--- a/demos/opengl/camera.cpp
+++ b/demos/opengl/camera.cpp
@@ -260,7 +260,7 @@ void Camera::activateGL(void)
 
 Vector3f Camera::unProject(const Vector2f& uv, float depth) const
 {
-    Matrix4f inv = mViewMatrix.inverse();
+    Matrix4f inv = mViewMatrix.inverse().matrix();
     return unProject(uv, depth, inv);
 }