diff --git a/scripts/docker/docker.mk b/scripts/docker/docker.mk
index a31ad9db..8943bf0e 100644
--- a/scripts/docker/docker.mk
+++ b/scripts/docker/docker.mk
@@ -22,7 +22,7 @@ _docker: # Docker command wrapper - mandatory: cmd=[command to execute]; optiona
 	# 'DOCKER_IMAGE' and 'DOCKER_TITLE' are passed to the functions as environment variables
 	DOCKER_IMAGE=$(or ${DOCKER_IMAGE}, $(or ${docker_image}, $(or ${IMAGE}, $(or ${image}, ghcr.io/org/repo))))
 	DOCKER_TITLE=$(or "${DOCKER_TITLE}", $(or "${docker_title}", $(or "${TITLE}", $(or "${title}", "Service Docker image"))))
-	source scripts/docker/docker.lib.sh
+	. "scripts/docker/docker.lib.sh"
 	dir=$(realpath ${dir})
 	docker-${cmd} # 'dir' is accessible by the function as environment variable
 
@@ -41,7 +41,7 @@ docker-test-suite-run: # Run Docker test suite @ExamplesAndTests
 	scripts/docker/tests/docker.test.sh
 
 docker-example-build: # Build Docker example @ExamplesAndTests
-	source scripts/docker/docker.lib.sh
+	. "scripts/docker/docker.lib.sh"
 	cd scripts/docker/examples/python
 	DOCKER_IMAGE=repository-template/docker-example-python
 	DOCKER_TITLE="Repository Template Docker Python Example"
@@ -53,7 +53,7 @@ docker-example-lint: # Lint Docker example @ExamplesAndTests
 	file=$${dockerfile} scripts/docker/dockerfile-linter.sh
 
 docker-example-run: # Run Docker example @ExamplesAndTests
-	source scripts/docker/docker.lib.sh
+	. "scripts/docker/docker.lib.sh"
 	cd scripts/docker/examples/python
 	DOCKER_IMAGE=repository-template/docker-example-python
 	args=" \
@@ -63,7 +63,7 @@ docker-example-run: # Run Docker example @ExamplesAndTests
 	docker-run
 
 docker-example-clean: # Remove Docker example resources @ExamplesAndTests
-	source scripts/docker/docker.lib.sh
+	. "scripts/docker/docker.lib.sh"
 	cd scripts/docker/examples/python
 	DOCKER_IMAGE=repository-template/docker-example-python
 	docker-clean
diff --git a/scripts/init.mk b/scripts/init.mk
index 373f8a4f..53385af3 100644
--- a/scripts/init.mk
+++ b/scripts/init.mk
@@ -7,7 +7,7 @@ include scripts/tests/test.mk
 # ==============================================================================
 
 runner-act: # Run GitHub Actions locally - mandatory: workflow=[workflow file name], job=[job name] @Development
-	source ./scripts/docker/docker.lib.sh
+	. "./scripts/docker/docker.lib.sh"
 	act $(shell [[ "${VERBOSE}" =~ ^(true|yes|y|on|1|TRUE|YES|Y|ON)$$ ]] && echo --verbose) \
 		--container-architecture linux/amd64 \
 		--platform ubuntu-latest=$$(name="ghcr.io/nhs-england-tools/github-runner-image" docker-get-image-version-and-pull) \
@@ -21,7 +21,7 @@ runner-act: # Run GitHub Actions locally - mandatory: workflow=[workflow file na
 		--job ${job}
 
 version-create-effective-file: # Create effective version file - optional: dir=[path to the VERSION file to use, default is '.'], BUILD_DATETIME=[build date and time in the '%Y-%m-%dT%H:%M:%S%z' format generated by the CI/CD pipeline, default is current date and time] @Development
-	source scripts/docker/docker.lib.sh
+	. "scripts/docker/docker.lib.sh"
 	version-create-effective-file
 
 shellscript-lint-all: # Lint all shell scripts in this project, do not fail on error, just print the error messages @Quality
diff --git a/scripts/terraform/terraform.mk b/scripts/terraform/terraform.mk
index 6339b196..1ee433de 100644
--- a/scripts/terraform/terraform.mk
+++ b/scripts/terraform/terraform.mk
@@ -47,7 +47,7 @@ clean:: # Remove Terraform files (terraform) - optional: terraform_dir|dir=[path
 
 _terraform: # Terraform command wrapper - mandatory: cmd=[command to execute]; optional: dir=[path to a directory where the command will be executed, relative to the project's top-level directory, default is one of the module variables or the example directory, if not set], opts=[options to pass to the Terraform command, default is none/empty]
 	dir=$(or ${dir}, ${TERRAFORM_STACK})
-	source scripts/terraform/terraform.lib.sh
+	. "scripts/terraform/terraform.lib.sh"
 	terraform-${cmd} # 'dir' and 'opts' are accessible by the function as environment variables, if set
 
 # ==============================================================================