diff --git a/Makefile b/Makefile
index 78bd476..079e8c2 100755
--- a/Makefile
+++ b/Makefile
@@ -209,13 +209,13 @@ binfmt-register:
 
 .PHONY: version
 version:
-	@if printf -- '%s' '$(IMAGE_VERSION)' | grep -q '^v[0-9]\{1,\}$$'; then \
+	@if printf '%s' '$(IMAGE_VERSION)' | grep -q '^v[0-9]\{1,\}$$'; then \
 		NEW_IMAGE_VERSION=$$(awk -v 'v=$(IMAGE_VERSION)' 'BEGIN {printf "v%.0f", substr(v,2)+1}'); \
-		printf -- '%s\n' "$${NEW_IMAGE_VERSION:?}" > '$(VERSION_FILE)'; \
+		printf '%s\n' "$${NEW_IMAGE_VERSION:?}" > '$(VERSION_FILE)'; \
 		'$(GIT)' add '$(VERSION_FILE)'; '$(GIT)' commit -m "$${NEW_IMAGE_VERSION:?}"; \
 		'$(GIT)' tag -a "$${NEW_IMAGE_VERSION:?}" -m "$${NEW_IMAGE_VERSION:?}"; \
 	else \
-		>&2 printf -- 'Malformed version string: %s\n' '$(IMAGE_VERSION)'; \
+		>&2 printf 'Malformed version string: %s\n' '$(IMAGE_VERSION)'; \
 		exit 1; \
 	fi
 
diff --git a/run-with-xdummy.sh b/run-with-xdummy.sh
index 4eb6946..574c1ee 100755
--- a/run-with-xdummy.sh
+++ b/run-with-xdummy.sh
@@ -17,26 +17,26 @@ containerExists() { "${DOCKER:?}" ps -af name="${1:?}" --format '{{.Names}}' | g
 containerIsRunning() { "${DOCKER:?}" ps -f name="${1:?}" --format '{{.Names}}' | grep -Fxq "${1:?}"; }
 
 if ! imageExists "${IMAGE_NAME:?}" && ! imageExists "${IMAGE_NAME#docker.io/}"; then
-	>&2 printf -- '%s\n' "\"${IMAGE_NAME:?}\" image doesn't exist!"
+	>&2 printf '%s\n' "\"${IMAGE_NAME:?}\" image doesn't exist!"
 	exit 1
 fi
 
 if containerIsRunning "${CONTAINER_NAME:?}"; then
-	printf -- '%s\n' "Stopping \"${CONTAINER_NAME:?}\" container..."
+	printf '%s\n' "Stopping \"${CONTAINER_NAME:?}\" container..."
 	"${DOCKER:?}" stop "${CONTAINER_NAME:?}" >/dev/null
 fi
 
 if containerExists "${CONTAINER_NAME:?}"; then
-	printf -- '%s\n' "Removing \"${CONTAINER_NAME:?}\" container..."
+	printf '%s\n' "Removing \"${CONTAINER_NAME:?}\" container..."
 	"${DOCKER:?}" rm "${CONTAINER_NAME:?}" >/dev/null
 fi
 
 CONTAINER_DEVICES=$(find /dev/ -mindepth 1 -maxdepth 1 \
 	'(' -name 'tty*' -or -name 'dri' -or -name 'vga_arbiter' -or -name 'nvidia*' -or -name 'nvhost*' -or -name 'nvmap' ')' \
-	-exec printf -- '--device %s:%s\n' '{}' '{}' ';' \
+	-exec printf '--device %s:%s\n' '{}' '{}' ';' \
 )
 
-printf -- '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
+printf '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
 # shellcheck disable=SC2086
 "${DOCKER:?}" run \
 	--name "${CONTAINER_NAME:?}" \
@@ -49,5 +49,5 @@ printf -- '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
 	${CONTAINER_DEVICES?} \
 	"${IMAGE_NAME:?}" "$@" >/dev/null
 
-printf -- '%s\n\n' 'Done!'
+printf '%s\n\n' 'Done!'
 exec "${DOCKER:?}" logs -f "${CONTAINER_NAME:?}"
diff --git a/run.sh b/run.sh
index fcf43e9..f23d589 100755
--- a/run.sh
+++ b/run.sh
@@ -17,26 +17,26 @@ containerExists() { "${DOCKER:?}" ps -af name="${1:?}" --format '{{.Names}}' | g
 containerIsRunning() { "${DOCKER:?}" ps -f name="${1:?}" --format '{{.Names}}' | grep -Fxq "${1:?}"; }
 
 if ! imageExists "${IMAGE_NAME:?}" && ! imageExists "${IMAGE_NAME#docker.io/}"; then
-	>&2 printf -- '%s\n' "\"${IMAGE_NAME:?}\" image doesn't exist!"
+	>&2 printf '%s\n' "\"${IMAGE_NAME:?}\" image doesn't exist!"
 	exit 1
 fi
 
 if containerIsRunning "${CONTAINER_NAME:?}"; then
-	printf -- '%s\n' "Stopping \"${CONTAINER_NAME:?}\" container..."
+	printf '%s\n' "Stopping \"${CONTAINER_NAME:?}\" container..."
 	"${DOCKER:?}" stop "${CONTAINER_NAME:?}" >/dev/null
 fi
 
 if containerExists "${CONTAINER_NAME:?}"; then
-	printf -- '%s\n' "Removing \"${CONTAINER_NAME:?}\" container..."
+	printf '%s\n' "Removing \"${CONTAINER_NAME:?}\" container..."
 	"${DOCKER:?}" rm "${CONTAINER_NAME:?}" >/dev/null
 fi
 
 CONTAINER_DEVICES=$(find /dev/ -mindepth 1 -maxdepth 1 \
 	'(' -name 'dri' -or -name 'vga_arbiter' -or -name 'nvidia*' -or -name 'nvhost*' -or -name 'nvmap' ')' \
-	-exec printf -- '--device %s:%s\n' '{}' '{}' ';' \
+	-exec printf '--device %s:%s\n' '{}' '{}' ';' \
 )
 
-printf -- '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
+printf '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
 # shellcheck disable=SC2086
 "${DOCKER:?}" run \
 	--name "${CONTAINER_NAME:?}" \
@@ -48,5 +48,5 @@ printf -- '%s\n' "Creating \"${CONTAINER_NAME:?}\" container..."
 	${CONTAINER_DEVICES?} \
 	"${IMAGE_NAME:?}" "$@" >/dev/null
 
-printf -- '%s\n\n' 'Done!'
+printf '%s\n\n' 'Done!'
 exec "${DOCKER:?}" logs -f "${CONTAINER_NAME:?}"