diff --git a/Makefile b/Makefile
index f42b168..6c011f0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,9 @@
-all:
-	for dot in *.dot; do make $${dot%%.dot}.png; done
-	for dot in *.dot; do make $${dot%%.dot}.pdf; done
-	for dot in *.dot; do make $${dot%%.dot}.svg; done
+all: $(addsuffix .png, $(basename $(wildcard *.dot))) $(addsuffix .pdf, $(basename $(wildcard *.dot))) $(addsuffix .svg, $(basename $(wildcard *.dot)))
+
+# all:
+# 	for dot in *.dot; do make $${dot%%.dot}.png; done
+# 	for dot in *.dot; do make $${dot%%.dot}.pdf; done
+# 	for dot in *.dot; do make $${dot%%.dot}.svg; done
 
 clean:
 	rm -f *.png *.pdf *.svg
diff --git a/ipv6-to-ipv4-proxy.dot b/ipv6-to-ipv4-proxy.dot
index b6c905f..b22a63e 100644
--- a/ipv6-to-ipv4-proxy.dot
+++ b/ipv6-to-ipv4-proxy.dot
@@ -1,6 +1,6 @@
 digraph G {
     node [ shape=box ]
-    rankdir=TB!;
+    rankdir=TB;
 
     label="IPv4-to-IPv6 proxy by ungleich.ch"