diff --git a/imgui-glow-renderer/examples/glow_04_custom_textures.rs b/imgui-glow-renderer/examples/glow_04_custom_textures.rs
index 2128ae3..bdf9e99 100644
--- a/imgui-glow-renderer/examples/glow_04_custom_textures.rs
+++ b/imgui-glow-renderer/examples/glow_04_custom_textures.rs
@@ -129,7 +129,7 @@ impl TexturesUi {
         const WIDTH: usize = 100;
         const HEIGHT: usize = 100;
 
-        let mut data = Vec::with_capacity(WIDTH * HEIGHT);
+        let mut data = Vec::with_capacity(WIDTH * HEIGHT * 3);
         for i in 0..WIDTH {
             for j in 0..HEIGHT {
                 // Insert RGB values