diff --git a/test/test_book/lang_de.tex.control b/test/test_book/lang_de.tex.control
index 5ed6126b..e65c9744 100644
--- a/test/test_book/lang_de.tex.control
+++ b/test/test_book/lang_de.tex.control
@@ -93,7 +93,8 @@ guitar,
     hyperfigures=true,
     colorlinks=true,
     linkcolor=tango-green-3,
-    urlcolor=tango-blue-3
+    urlcolor=tango-blue-3,
+    unicode=true
     ]{hyperref}
 
 
diff --git a/test/test_book/lang_default.tex.control b/test/test_book/lang_default.tex.control
index 40391656..1be40a10 100644
--- a/test/test_book/lang_default.tex.control
+++ b/test/test_book/lang_default.tex.control
@@ -93,7 +93,8 @@ guitar,
     hyperfigures=true,
     colorlinks=true,
     linkcolor=tango-green-3,
-    urlcolor=tango-blue-3
+    urlcolor=tango-blue-3,
+    unicode=true
     ]{hyperref}
 
 
diff --git a/test/test_book/lang_en.tex.control b/test/test_book/lang_en.tex.control
index 55573ddd..c2199ea6 100644
--- a/test/test_book/lang_en.tex.control
+++ b/test/test_book/lang_en.tex.control
@@ -93,7 +93,8 @@ guitar,
     hyperfigures=true,
     colorlinks=true,
     linkcolor=tango-green-3,
-    urlcolor=tango-blue-3
+    urlcolor=tango-blue-3,
+    unicode=true
     ]{hyperref}
 
 
diff --git a/test/test_book/lang_fr.tex.control b/test/test_book/lang_fr.tex.control
index aca45a48..2ae2df43 100644
--- a/test/test_book/lang_fr.tex.control
+++ b/test/test_book/lang_fr.tex.control
@@ -93,7 +93,8 @@ guitar,
     hyperfigures=true,
     colorlinks=true,
     linkcolor=tango-green-3,
-    urlcolor=tango-blue-3
+    urlcolor=tango-blue-3,
+    unicode=true
     ]{hyperref}
 
 
diff --git a/test/test_book/special.tex.control b/test/test_book/special.tex.control
index 8f7d845a..e2fa50fe 100644
--- a/test/test_book/special.tex.control
+++ b/test/test_book/special.tex.control
@@ -96,7 +96,8 @@ guitar,
     hyperfigures=true,
     colorlinks=true,
     linkcolor=tango-green-3,
-    urlcolor=tango-blue-3
+    urlcolor=tango-blue-3,
+    unicode=true
     ]{hyperref}