diff --git a/hack/make/.ensure-frozen-images b/hack/make/.ensure-frozen-images
index 74286bda47..fb8585b2da 100644
--- a/hack/make/.ensure-frozen-images
+++ b/hack/make/.ensure-frozen-images
@@ -3,33 +3,33 @@ set -e
 
 # image lists for different archs that should match what's in the Dockerfile (minus the explicit images IDs)
 case "$DOCKER_ENGINE_OSARCH" in
-	linux/arm) 
+	linux/arm)
 		images=(
-                	hypriot/armhf-busybox@ea0800bb83571c585c5652b53668e76b29c7c0eef719892f9d0a48607984f9e1
+			hypriot/armhf-busybox@ea0800bb83571c585c5652b53668e76b29c7c0eef719892f9d0a48607984f9e1
 			hypriot/armhf-hello-world@508c59a4f8b23c77bbcf43296c3f580873dc7eecb1f0d680cea3067e221fd4c2
-                	hypriot/armhf-unshare@3f1db65f8bbabc743fd739cf7145a56c35b2a0979ae3174e9d79b7fa4b00fca1
-        	)
+			hypriot/armhf-unshare@3f1db65f8bbabc743fd739cf7145a56c35b2a0979ae3174e9d79b7fa4b00fca1
+		)
 		;;
 	linux/ppc64le)
 		images=(
-                	ppc64le/busybox:latest
-                	ppc64le/hello-world:frozen
-                	ppc64le/unshare:latest
-        	)
+			ppc64le/busybox:latest
+			ppc64le/hello-world:frozen
+			ppc64le/unshare:latest
+		)
 		;;
 	linux/s390x)
 		images=(
 			s390x/busybox:latest
 			s390x/hello-world:frozen
-			s390x/unshare:latest	
+			s390x/unshare:latest
 		)
 		;;
 	*)
 		images=(
-                	busybox:latest
-                	hello-world:latest
-                	jess/unshare:latest
-        	)
+			busybox:latest
+			hello-world:latest
+			jess/unshare:latest
+		)
 		;;
 esac
 
@@ -67,19 +67,19 @@ fi
 case "$DOCKER_ENGINE_OSARCH" in
 	linux/arm)
 		docker tag hypriot/armhf-busybox:latest busybox:latest
-        	docker tag hypriot/armhf-hello-world:latest hello-world:frozen
-        	docker tag hypriot/armhf-unshare:latest jess/unshare:latest		
+		docker tag hypriot/armhf-hello-world:latest hello-world:frozen
+		docker tag hypriot/armhf-unshare:latest jess/unshare:latest
 		docker rmi hypriot/armhf-busybox:latest
-        	docker rmi hypriot/armhf-hello-world:latest
-        	docker rmi hypriot/armhf-unshare:latest
+		docker rmi hypriot/armhf-hello-world:latest
+		docker rmi hypriot/armhf-unshare:latest
 		;;
 	linux/ppc64le)
 		docker tag ppc64le/busybox:latest busybox:latest
-        	docker tag ppc64le/hello-world:frozen hello-world:frozen
+		docker tag ppc64le/hello-world:frozen hello-world:frozen
 		docker tag ppc64le/unshare:latest jess/unshare:latest
 		docker rmi ppc64le/busybox:latest
-        	docker rmi ppc64le/hello-world:frozen
-		docker rmi ppc64le/unshare:latest		
+		docker rmi ppc64le/hello-world:frozen
+		docker rmi ppc64le/unshare:latest
 		;;
 	linux/s390x)
 		docker tag s390x/busybox:latest busybox:latest