diff --git a/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart.sh b/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart.sh
index 7fe7ab1a90..014a3bf98c 100755
--- a/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart.sh
+++ b/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart.sh
@@ -10,7 +10,7 @@ source ${ZEPHYR_BASE}/tests/bsim/sh_common.source
 # connected over UART. The controller is the HCI UART sample.
 simulation_id="basic_conn_split_hci_uart"
 verbosity_level=2
-EXECUTE_TIMEOUT=10
+EXECUTE_TIMEOUT=20
 
 cd ${BSIM_OUT_PATH}/bin
 
diff --git a/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart_async.sh b/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart_async.sh
index 208395fd7f..a2d3728eb4 100755
--- a/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart_async.sh
+++ b/tests/bsim/bluetooth/hci_uart/tests_scripts/basic_conn_split_hci_uart_async.sh
@@ -10,7 +10,7 @@ source ${ZEPHYR_BASE}/tests/bsim/sh_common.source
 # connected over UART. The controller is the HCI UART async sample.
 simulation_id="basic_conn_split_hci_uart_async"
 verbosity_level=2
-EXECUTE_TIMEOUT=10
+EXECUTE_TIMEOUT=20
 
 cd ${BSIM_OUT_PATH}/bin