diff --git a/qgreenland/config/cfg-lock.json b/qgreenland/config/cfg-lock.json
index af8358dd..3896c9d7 100644
--- a/qgreenland/config/cfg-lock.json
+++ b/qgreenland/config/cfg-lock.json
@@ -12112,7 +12112,9 @@
                             "{input_dir}/downsampled.tif",
                             "{output_dir}/data_with_header.csv",
                             "&&",
-                            "sed -i '1s/^/x,y,vx,vy\n/' {output_dir}/data_with_header.csv"
+                            "echo \"x,y,vx,vy\" > {output_dir}/data_with_header.csv",
+                            "&&",
+                            "cat {output_dir}/as_xyz.xyz >> {output_dir}/data_with_header.csv"
                           ],
                           "type": "command"
                         },
diff --git a/qgreenland/config/layers/Glaciology/Ice sheet velocity/GrIMP/grimp.py b/qgreenland/config/layers/Glaciology/Ice sheet velocity/GrIMP/grimp.py
index a98906ea..5ac6c95f 100644
--- a/qgreenland/config/layers/Glaciology/Ice sheet velocity/GrIMP/grimp.py	
+++ b/qgreenland/config/layers/Glaciology/Ice sheet velocity/GrIMP/grimp.py	
@@ -152,9 +152,11 @@ def make_layer(
                 "-csv",
                 "-allbands",
                 "{input_dir}/downsampled.tif",
-                "{output_dir}/data_with_header.csv",
+                "{output_dir}/as_xyz.xyz",
                 "&&",
-                "sed -i '1s/^/x,y,vx,vy\n/' {output_dir}/data_with_header.csv",
+                'echo "x,y,vx,vy" > {output_dir}/data_with_header.csv',
+                "&&",
+                "cat {output_dir}/as_xyz.xyz >> {output_dir}/data_with_header.csv",
             ],
         ),
         # Finally, convert to gpkg.