diff --git a/python/plugins/processing/tests/testdata/expected/polys_to_lines.gfs b/python/plugins/processing/tests/testdata/expected/polys_to_lines.gfs
index 1aa78269eb0..ea3e274285e 100644
--- a/python/plugins/processing/tests/testdata/expected/polys_to_lines.gfs
+++ b/python/plugins/processing/tests/testdata/expected/polys_to_lines.gfs
@@ -2,10 +2,11 @@
   <GMLFeatureClass>
     <Name>polys_to_lines</Name>
     <ElementPath>polys_to_lines</ElementPath>
+    <!--LINESTRING-->
     <GeometryType>2</GeometryType>
     <SRSName>EPSG:4326</SRSName>
     <DatasetSpecificInfo>
-      <FeatureCount>4</FeatureCount>
+      <FeatureCount>5</FeatureCount>
       <ExtentXMin>0.00000</ExtentXMin>
       <ExtentXMax>9.00000</ExtentXMax>
       <ExtentYMin>-1.00000</ExtentYMin>
diff --git a/python/plugins/processing/tests/testdata/expected/polys_to_lines.gml b/python/plugins/processing/tests/testdata/expected/polys_to_lines.gml
index ce07984e3fe..6fb2f5867f5 100644
--- a/python/plugins/processing/tests/testdata/expected/polys_to_lines.gml
+++ b/python/plugins/processing/tests/testdata/expected/polys_to_lines.gml
@@ -25,12 +25,12 @@
     </ogr:polys_to_lines>
   </gml:featureMember>
   <gml:featureMember>
-    <ogr:polys_to_lines fid="multipolys.1">
+    <ogr:polys_to_lines fid="multipolys.2">
       <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>7,6 7,5 7,4 8,4 9,5 9,6 7,6</gml:coordinates></gml:LineString></ogr:geometryProperty>
     </ogr:polys_to_lines>
   </gml:featureMember>
   <gml:featureMember>
-    <ogr:polys_to_lines fid="multipolys.2">
+    <ogr:polys_to_lines fid="multipolys.3">
       <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>0,0 0,1 1,1 1,0 0,0</gml:coordinates></gml:LineString></ogr:geometryProperty>
       <ogr:Bname>Test</ogr:Bname>
       <ogr:Bintval>2</ogr:Bintval>
@@ -38,7 +38,7 @@
     </ogr:polys_to_lines>
   </gml:featureMember>
   <gml:featureMember>
-    <ogr:polys_to_lines fid="multipolys.3">
+    <ogr:polys_to_lines fid="multipolys.4">
       <ogr:Bname>Test</ogr:Bname>
       <ogr:Bintval>3</ogr:Bintval>
       <ogr:Bfloatval>0</ogr:Bfloatval>
diff --git a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
index 2ad81d07163..5c7d77613a7 100644
--- a/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
+++ b/python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml
@@ -148,6 +148,9 @@ tests:
       OUTPUT:
         name: expected/polys_to_lines.gml
         type: vector
+        compare:
+          fields:
+            fid: skip
 
   - algorithm: qgis:basicstatisticsfornumericfields
     name: Basic statistics for numeric fields