diff --git a/examples/src/bin/interactive_fractal/app.rs b/examples/src/bin/interactive_fractal/app.rs
index cdeb48fec9..ed05ff6235 100644
--- a/examples/src/bin/interactive_fractal/app.rs
+++ b/examples/src/bin/interactive_fractal/app.rs
@@ -111,7 +111,7 @@ Usage:
     }
 
     /// Run our compute pipeline and return a future of when the compute is finished
-    pub fn compute(&mut self, image_target: DeviceImageView) -> Box<dyn GpuFuture> {
+    pub fn compute(&self, image_target: DeviceImageView) -> Box<dyn GpuFuture> {
         self.fractal_pipeline.compute(
             image_target,
             self.c,
diff --git a/examples/src/bin/interactive_fractal/pixels_draw_pipeline.rs b/examples/src/bin/interactive_fractal/pixels_draw_pipeline.rs
index 878deaec2b..6e4e3e9c92 100644
--- a/examples/src/bin/interactive_fractal/pixels_draw_pipeline.rs
+++ b/examples/src/bin/interactive_fractal/pixels_draw_pipeline.rs
@@ -162,7 +162,7 @@ impl PixelsDrawPipeline {
 
     /// Draw input `image` over a quad of size -1.0 to 1.0
     pub fn draw(
-        &mut self,
+        &self,
         viewport_dimensions: [u32; 2],
         image: Arc<dyn ImageViewAbstract>,
     ) -> SecondaryAutoCommandBuffer {
diff --git a/examples/src/bin/interactive_fractal/place_over_frame.rs b/examples/src/bin/interactive_fractal/place_over_frame.rs
index d11c5387c3..a068e18bfe 100644
--- a/examples/src/bin/interactive_fractal/place_over_frame.rs
+++ b/examples/src/bin/interactive_fractal/place_over_frame.rs
@@ -72,7 +72,7 @@ impl RenderPassPlaceOverFrame {
     /// Place view exactly over swapchain image target.
     /// Texture draw pipeline uses a quad onto which it places the view.
     pub fn render<F>(
-        &mut self,
+        &self,
         before_future: F,
         view: DeviceImageView,
         target: SwapchainImageView,
diff --git a/examples/src/bin/shader-types-sharing.rs b/examples/src/bin/shader-types-sharing.rs
index d178945bd2..0a601419d5 100644
--- a/examples/src/bin/shader-types-sharing.rs
+++ b/examples/src/bin/shader-types-sharing.rs
@@ -199,7 +199,7 @@ fn main() {
         data_buffer: Arc<CpuAccessibleBuffer<[u32]>>,
         parameters: shaders::ty::Parameters,
         command_buffer_allocator: &StandardCommandBufferAllocator,
-        descriptor_set_allocator: &mut StandardDescriptorSetAllocator,
+        descriptor_set_allocator: &StandardDescriptorSetAllocator,
     ) {
         let layout = pipeline.layout().set_layouts().get(0).unwrap();
         let set = PersistentDescriptorSet::new(
@@ -238,7 +238,7 @@ fn main() {
     }
 
     let command_buffer_allocator = StandardCommandBufferAllocator::new(device.clone());
-    let mut descriptor_set_allocator = StandardDescriptorSetAllocator::new(device.clone());
+    let descriptor_set_allocator = StandardDescriptorSetAllocator::new(device.clone());
 
     // Preparing test data array `[0, 1, 2, 3....]`
     let data_buffer = {
@@ -288,7 +288,7 @@ fn main() {
         data_buffer.clone(),
         shaders::ty::Parameters { value: 2 },
         &command_buffer_allocator,
-        &mut descriptor_set_allocator,
+        &descriptor_set_allocator,
     );
 
     // Then add 1 to each value
@@ -298,7 +298,7 @@ fn main() {
         data_buffer.clone(),
         shaders::ty::Parameters { value: 1 },
         &command_buffer_allocator,
-        &mut descriptor_set_allocator,
+        &descriptor_set_allocator,
     );
 
     // Then multiply each value by 3
@@ -308,7 +308,7 @@ fn main() {
         data_buffer.clone(),
         shaders::ty::Parameters { value: 3 },
         &command_buffer_allocator,
-        &mut descriptor_set_allocator,
+        &descriptor_set_allocator,
     );
 
     let data_buffer_content = data_buffer.read().unwrap();