diff --git a/examples/cluster.c b/examples/cluster.c
index 3d3f955..6840012 100644
--- a/examples/cluster.c
+++ b/examples/cluster.c
@@ -151,7 +151,7 @@ int main(int argc, char **argv) {
     };
 
     cairo_surface_t *sfc;
-    cairo_t *ctx;
+    cairo_t *cr;
 
     XEvent e;
 
@@ -169,9 +169,9 @@ int main(int argc, char **argv) {
     sfc = cairo_xlib_surface_create(display, buf, DefaultVisual(display, screen), x, y);
     cairo_xlib_surface_set_size(sfc, x, y);
 
-    ctx = cairo_create(sfc);
+    cr = cairo_create(sfc);
 
-    redraw(ctx);
+    redraw(cr);
 
     while (1) {
         XExposeEvent *expose;
@@ -198,7 +198,7 @@ int main(int argc, char **argv) {
     }
 
 done:
-    cairo_destroy(ctx);
+    cairo_destroy(cr);
 
     cairo_surface_destroy(sfc);
     XCloseDisplay(display);