diff --git a/database/DBcellsrch.c b/database/DBcellsrch.c
index 8bc146bd..2c14301a 100644
--- a/database/DBcellsrch.c
+++ b/database/DBcellsrch.c
@@ -83,7 +83,7 @@ struct seeTypesArg
  */
 
 int
-DBSrCellPlaneArea(BPlane *plane, Rect *rect, int (*func)(), ClientData arg)
+DBSrCellPlaneArea(BPlane *plane, const Rect *rect, int (*func)(), ClientData arg)
 {
     BPEnum *bpe;
     CellUse *use;
diff --git a/database/database.h.in b/database/database.h.in
index 220a5ae1..299754ef 100644
--- a/database/database.h.in
+++ b/database/database.h.in
@@ -970,7 +970,7 @@ extern void DBUndoPutLabel();
 extern bool DBCellRename();
 extern bool DBCellDelete();
 extern int  DBCellSrArea();
-extern int  DBSrCellPlaneArea();
+extern int  DBSrCellPlaneArea(BPlane *plane, const Rect *rect, int (*func)(), ClientData arg);
 extern int  DBMoveCell();
 extern bool DBReLinkCell();
 extern int  DBBoundCellPlane();