diff --git a/src/net/sourceforge/plantuml/dot/GraphvizUtils.java b/src/net/sourceforge/plantuml/dot/GraphvizUtils.java
index 803023cbc..23261f328 100644
--- a/src/net/sourceforge/plantuml/dot/GraphvizUtils.java
+++ b/src/net/sourceforge/plantuml/dot/GraphvizUtils.java
@@ -197,7 +197,7 @@ public class GraphvizUtils {
 		if (s == null)
 			return -1;
 
-		final Pattern p = Pattern.compile("\\s(\\d)\\.(\\d\\d?)\\D");
+		final Pattern p = Pattern.compile("\\s(\\d+)\\.(\\d\\d?)\\D");
 		final Matcher m = p.matcher(s);
 		if (m.find() == false)
 			return -1;
diff --git a/src/net/sourceforge/plantuml/dot/GraphvizVersionFinder.java b/src/net/sourceforge/plantuml/dot/GraphvizVersionFinder.java
index 8a58e7b25..706bb5f0a 100644
--- a/src/net/sourceforge/plantuml/dot/GraphvizVersionFinder.java
+++ b/src/net/sourceforge/plantuml/dot/GraphvizVersionFinder.java
@@ -73,7 +73,7 @@ public class GraphvizVersionFinder {
 
 	public GraphvizVersion getVersion() {
 		final String dotVersion = dotVersion();
-		final Pattern p = Pattern.compile("(\\d)\\.(\\d\\d?)");
+		final Pattern p = Pattern.compile("(\\d+)\\.(\\d\\d?)");
 		final Matcher m = p.matcher(dotVersion);
 		final boolean find = m.find();
 		if (find == false)