diff --git a/doc/src/api/util/sc_base64_decode.xml b/doc/src/api/util/sc_base64_decode.xml
index cd9673cc..e00b6db4 100644
--- a/doc/src/api/util/sc_base64_decode.xml
+++ b/doc/src/api/util/sc_base64_decode.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <refentry id="scbase64decode">
 	<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
 	<refmeta>
diff --git a/doc/src/api/util/sc_base64_encode.xml b/doc/src/api/util/sc_base64_encode.xml
index b0b46b11..5e60197f 100644
--- a/doc/src/api/util/sc_base64_encode.xml
+++ b/doc/src/api/util/sc_base64_encode.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <refentry id="scbase64encode">
 	<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
 	<refmeta>
diff --git a/doc/src/api/util/sc_der_clear.xml b/doc/src/api/util/sc_der_clear.xml
index 6abbe10f..d7298f47 100644
--- a/doc/src/api/util/sc_der_clear.xml
+++ b/doc/src/api/util/sc_der_clear.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <refentry id="scderclear">
 	<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
 	<refmeta>
diff --git a/doc/src/api/util/sc_der_copy.xml b/doc/src/api/util/sc_der_copy.xml
index a9d52f41..c18a27de 100644
--- a/doc/src/api/util/sc_der_copy.xml
+++ b/doc/src/api/util/sc_der_copy.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <refentry id="scdercopy">
 	<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
 	<refmeta>
diff --git a/doc/src/api/util/sc_strerror.xml b/doc/src/api/util/sc_strerror.xml
index ff62540c..e094a269 100644
--- a/doc/src/api/util/sc_strerror.xml
+++ b/doc/src/api/util/sc_strerror.xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <refentry id="scstrerror">
 	<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
 	<refmeta>