diff --git a/parachain/test-parachains/adder/collator/src/main.rs b/parachain/test-parachains/adder/collator/src/main.rs
index fe9f8b6f538d..f9efa9c68ad3 100644
--- a/parachain/test-parachains/adder/collator/src/main.rs
+++ b/parachain/test-parachains/adder/collator/src/main.rs
@@ -21,6 +21,7 @@ use polkadot_node_primitives::CollationGenerationConfig;
 use polkadot_node_subsystem::messages::{CollationGenerationMessage, CollatorProtocolMessage};
 use polkadot_primitives::Id as ParaId;
 use sc_cli::{Error as SubstrateCliError, SubstrateCli};
+use sc_service::Role;
 use sp_core::hexdisplay::HexDisplay;
 use test_parachain_adder_collator::Collator;
 
@@ -57,6 +58,9 @@ fn main() -> Result<()> {
 				let collator = Collator::new();
 
 				config.disable_beefy = true;
+				// Zombienet is spawning all collators currently with the same CLI, this means it
+				// sets `--validator` and this is wrong here.
+				config.role = Role::Full;
 				let full_node = polkadot_service::build_full(
 					config,
 					polkadot_service::NewFullParams {
diff --git a/parachain/test-parachains/undying/collator/src/main.rs b/parachain/test-parachains/undying/collator/src/main.rs
index 9bcafde29d18..8eadc233ae78 100644
--- a/parachain/test-parachains/undying/collator/src/main.rs
+++ b/parachain/test-parachains/undying/collator/src/main.rs
@@ -21,6 +21,7 @@ use polkadot_node_primitives::CollationGenerationConfig;
 use polkadot_node_subsystem::messages::{CollationGenerationMessage, CollatorProtocolMessage};
 use polkadot_primitives::Id as ParaId;
 use sc_cli::{Error as SubstrateCliError, SubstrateCli};
+use sc_service::Role;
 use sp_core::hexdisplay::HexDisplay;
 use test_parachain_undying_collator::Collator;
 
@@ -57,6 +58,9 @@ fn main() -> Result<()> {
 				let collator = Collator::new(cli.run.pov_size, cli.run.pvf_complexity);
 
 				config.disable_beefy = true;
+				// Zombienet is spawning all collators currently with the same CLI, this means it
+				// sets `--validator` and this is wrong here.
+				config.role = Role::Full;
 				let full_node = polkadot_service::build_full(
 					config,
 					polkadot_service::NewFullParams {