diff --git a/gsdf_gpu_test.go b/gsdf_gpu_test.go
index 4ef732f..23cd4f4 100644
--- a/gsdf_gpu_test.go
+++ b/gsdf_gpu_test.go
@@ -17,7 +17,6 @@ import (
 	"github.com/soypat/gsdf/glbuild"
 	"github.com/soypat/gsdf/gleval"
 )
-
 // Since GPU must be run in main thread we need to do some dark arts for GPU code to be code-covered.
 func TestMain(m *testing.M) {
 	runtime.LockOSThread()
diff --git a/gsdfaux/ui.go b/gsdfaux/ui.go
index 9b4554b..250cb77 100644
--- a/gsdfaux/ui.go
+++ b/gsdfaux/ui.go
@@ -140,7 +140,7 @@ void main() {
 		deltaX := xpos - lastMouseX
 		deltaY := ypos - lastMouseY
 
-		yaw += deltaX * yawSensitivity
+		yaw -= deltaX * yawSensitivity
 		pitch -= deltaY * pitchSensitivity // Invert y-axis
 
 		// Clamp pitch