diff --git a/raster/r.water.outlet/over_cells.c b/raster/r.water.outlet/over_cells.c
index c3ea6e1f860..dd012ba909f 100644
--- a/raster/r.water.outlet/over_cells.c
+++ b/raster/r.water.outlet/over_cells.c
@@ -43,6 +43,7 @@ int overland_cells(int row, int col)
             }
         }
     }
+    G_free(Acells);
 
     return 0;
 }