diff --git a/src/cairo-surface-observer-private.h b/src/cairo-surface-observer-private.h
index 70c87db82..6ed0c18d1 100644
--- a/src/cairo-surface-observer-private.h
+++ b/src/cairo-surface-observer-private.h
@@ -62,7 +62,7 @@ struct extents {
 };
 
 struct pattern {
-    unsigned int type[7]; /* native/record/other surface/gradients */
+    unsigned int type[8]; /* native/record/other surface/gradients */
 };
 
 struct path {