diff --git a/helpers/assert_device_present b/helpers/assert_device_present
index 584bdf1..bdfa6b6 100755
--- a/helpers/assert_device_present
+++ b/helpers/assert_device_present
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source bootrr
+. bootrr
 
 TEST_CASE_ID="$1"
 DRIVER="$2"
diff --git a/helpers/assert_driver_present b/helpers/assert_driver_present
index 719af8a..b7c4819 100755
--- a/helpers/assert_driver_present
+++ b/helpers/assert_driver_present
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source bootrr
+. bootrr
 
 TEST_CASE_ID="$1"
 DRIVER="$2"
diff --git a/helpers/ensure_lib_firmware b/helpers/ensure_lib_firmware
index f64a493..92e9cfc 100755
--- a/helpers/ensure_lib_firmware
+++ b/helpers/ensure_lib_firmware
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-source bootrr
+. bootrr
 
 TEST_CASE_ID="$1"
 PARTITION=/dev/disk/by-partlabel/userdata