diff --git a/source/blender/editors/physics/particle_edit.c b/source/blender/editors/physics/particle_edit.c
index e722173bcfa..6ce3e7c06c6 100644
--- a/source/blender/editors/physics/particle_edit.c
+++ b/source/blender/editors/physics/particle_edit.c
@@ -413,7 +413,7 @@ typedef struct PEData {
 	RNG *rng;
 
 	const int *mval;
-	rcti *rect;
+	const rcti *rect;
 	float rad;
 	float dist;
 	float dval;