diff --git a/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/SokalMichener1958.lua b/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/SokalMichener1958.lua
index 6a665b673..00aa840cb 100644
--- a/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/SokalMichener1958.lua
+++ b/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/SokalMichener1958.lua
@@ -45,19 +45,22 @@ declare {
     This algorithm uses a distance matrix, ideally an ultrametric
     one, to compute the graph.
   "]],
-  examples = [["
-    \tikz \graph [phylogenetic tree layout, sibling distance=0pt, sibling sep=2pt,
-                  unweighted pair group method using arithmetic averages,
-                  distance matrix={
-                    0 4 9 9 9 9 9
-                    4 0 9 9 9 9 9
-                    9 9 0 2 7 7 7
-                    9 9 2 0 7 7 7
-                    9 9 7 7 0 3 5
-                    9 9 7 7 3 0 5
-                    9 9 7 7 5 5 0}]
-      { a, b, c, d, e, f, g };
-  "]]
+  examples = {
+    options = [[ preamble=\usetikzlibrary{graphs,graphdrawing} \usegdlibrary{phylogenetics} ]],
+    [[
+      \tikz \graph [phylogenetic tree layout, sibling distance=0pt, sibling sep=2pt,
+                    unweighted pair group method using arithmetic averages,
+                    distance matrix={
+                      0 4 9 9 9 9 9
+                      4 0 9 9 9 9 9
+                      9 9 0 2 7 7 7
+                      9 9 2 0 7 7 7
+                      9 9 7 7 0 3 5
+                      9 9 7 7 3 0 5
+                      9 9 7 7 5 5 0}]
+        { a, b, c, d, e, f, g };
+    ]]
+  }
 }