diff --git a/tests/api/controllers/supervisor_proto/supervisor_proto.c b/tests/api/controllers/supervisor_proto/supervisor_proto.c
index 6162af691e1..4174725b469 100644
--- a/tests/api/controllers/supervisor_proto/supervisor_proto.c
+++ b/tests/api/controllers/supervisor_proto/supervisor_proto.c
@@ -85,7 +85,6 @@ int main(int argc, char **argv) {
   const struct FieldDefinition *expected_fields[] = {
     (const struct FieldDefinition[]){ // SolidProtoHierarchy
       {"translationStep", WB_SF_FLOAT},
-      {"children", WB_MF_NODE},
       {"internalTranslationStep", WB_SF_FLOAT},
       {"internalField1", WB_SF_FLOAT},
       {"internalField2", WB_SF_FLOAT},
diff --git a/tests/api/protos/SolidProtoHierarchy.proto b/tests/api/protos/SolidProtoHierarchy.proto
index 40608eded2e..3e47d0d5162 100644
--- a/tests/api/protos/SolidProtoHierarchy.proto
+++ b/tests/api/protos/SolidProtoHierarchy.proto
@@ -4,7 +4,6 @@ EXTERNPROTO "webots://tests/api/protos/SolidProtoHierarchyInternal.proto"
 
 PROTO SolidProtoHierarchy [
   field SFFloat translationStep         0.01
-  field MFNode  children                []
   field SFFloat internalTranslationStep 0.01
   field SFFloat internalField1          0.01
   field SFFloat internalField2          0.01
@@ -17,9 +16,6 @@ PROTO SolidProtoHierarchy [
     # Note: For the purposes of the test, SolidProtoHierarchyInternal.rotationStep,
     # SolidProtoHierarchyInternal.ucField1, and SolidProtoHierarchyInternal.ucField2 are explicitly left unconnected
     children [
-      Group {
-        children IS children
-      }
       DEF INTERNAL_NODE SolidProtoHierarchyInternal {
         translationStep IS internalTranslationStep
         ucField2 IS internalField2