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-rw-r--r--crawl-ref/source/ray.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/crawl-ref/source/ray.h b/crawl-ref/source/ray.h
index acea3a33c1..9c72098981 100644
--- a/crawl-ref/source/ray.h
+++ b/crawl-ref/source/ray.h
@@ -32,7 +32,7 @@ public:
void advance_and_bounce();
void regress();
- int footprint(int radius2, int xpos[], int ypos[]);
+ int footprint(int radius2, int xpos[], int ypos[]) const;
// Gets/sets the slope in terms of degrees, with 0 = east, 90 = north,
// 180 = west, 270 = south, 360 = east, -90 = south, etc