diff --git a/maven-javadoc-plugin.changes b/maven-javadoc-plugin.changes
index a5ea91f..e6c411c 100644
--- a/maven-javadoc-plugin.changes
+++ b/maven-javadoc-plugin.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Mon Mar 14 06:23:46 UTC 2022 - Fridrich Strba <fstrba@suse.com>
+
+- Added patch:
+  * stale-data-encoding.patch
+    + use the same encoding when writing and getting the stale data
+    + fixes build with utf-8 sources on non utf-8 platforms
+
 -------------------------------------------------------------------
 Fri Mar 11 07:05:23 UTC 2022 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/maven-javadoc-plugin.spec b/maven-javadoc-plugin.spec
index 22b2512..228077e 100644
--- a/maven-javadoc-plugin.spec
+++ b/maven-javadoc-plugin.spec
@@ -32,6 +32,7 @@ URL:            http://maven.apache.org/plugins/maven-javadoc-plugin
 Source0:        https://repo1.maven.org/maven2/org/apache/maven/plugins/%{base_name}/%{version}/%{base_name}-%{version}-source-release.zip
 Source1:        %{base_name}-build.xml
 Patch0:         %{base_name}-bootstrap-resources.patch
+Patch1:         stale-data-encoding.patch
 BuildRequires:  apache-commons-cli
 BuildRequires:  apache-commons-io
 BuildRequires:  apache-commons-lang3
@@ -120,6 +121,7 @@ API documentation for %{name}.
 cp %{SOURCE1} build.xml
 %patch0 -p1
 %endif
+%patch1 -p1
 
 %pom_xpath_remove pom:project/pom:parent/pom:relativePath
 %pom_remove_dep :::test:
diff --git a/stale-data-encoding.patch b/stale-data-encoding.patch
new file mode 100644
index 0000000..dcdbf50
--- /dev/null
+++ b/stale-data-encoding.patch
@@ -0,0 +1,53 @@
+--- maven-javadoc-plugin-3.3.2/src/main/java/org/apache/maven/plugins/javadoc/StaleHelper.java	2022-02-07 20:52:42.000000000 +0100
++++ maven-javadoc-plugin-3.3.2/src/main/java/org/apache/maven/plugins/javadoc/StaleHelper.java	2022-03-14 07:46:55.466835949 +0100
+@@ -43,6 +43,19 @@
+ public class StaleHelper
+ {
+ 
++    private static Charset getDataCharset()
++    {
++        if ( JavaVersion.JAVA_SPECIFICATION_VERSION.isAtLeast( "9" )
++            && JavaVersion.JAVA_SPECIFICATION_VERSION.isBefore( "12" ) )
++        {
++            return StandardCharsets.UTF_8;
++        }
++        else
++        {
++            return Charset.defaultCharset();
++        }
++    }
++
+     /**
+      * Compute the data used to detect a stale javadoc
+      *
+@@ -61,16 +74,7 @@
+             String[] args = cmd.getArguments();
+             Collections.addAll( options, args );
+             
+-            final Charset cs;
+-            if ( JavaVersion.JAVA_SPECIFICATION_VERSION.isAtLeast( "9" )
+-                && JavaVersion.JAVA_SPECIFICATION_VERSION.isBefore( "12" ) )
+-            {
+-                cs = StandardCharsets.UTF_8;
+-            }
+-            else
+-            {
+-                cs = Charset.defaultCharset();
+-            }
++            final Charset cs = getDataCharset();
+             
+             for ( String arg : args )
+             {
+@@ -141,9 +145,11 @@
+     {
+         try
+         {
++            final Charset cs = getDataCharset();
++            
+             String curdata = getStaleData( cmd );
+             Files.createDirectories( path.getParent() );
+-            Files.write( path, Collections.singleton( curdata ), Charset.defaultCharset() );
++            Files.write( path, Collections.singleton( curdata ), cs);
+         }
+         catch ( IOException e )
+         {