diff --git a/java/build.xml b/java/build.xml
index 27b7869f42..0ba58c8cda 100644
--- a/java/build.xml
+++ b/java/build.xml
@@ -2,14 +2,14 @@
 <project name="Java Mode" default="build">
 
   <property name="generated"
-	    value="${basedir}/generated/processing/mode/java/preproc" />
+            value="${basedir}/generated/processing/mode/java/preproc" />
   <mkdir dir="${generated}" />
 
   <property name="grammars"
-	    value="${basedir}/src/processing/mode/java/preproc" />
+            value="${basedir}/src/processing/mode/java/preproc" />
 
   <property name="antlr_jar"
-	    value="${basedir}/mode/antlr-4.7.2-complete.jar" />
+            value="${basedir}/mode/antlr-4.7.2-complete.jar" />
 
   <property name="mode_jar"
             value="${basedir}/mode/JavaMode.jar" />
@@ -24,12 +24,12 @@
     <delete file="${mode_jar}" />
     <delete>
       <fileset dir="${generated}">
-	<include name="*.java" />
-	<include name="*.tokens" />
-	<include name="*.txt" />
-	<include name="*.g" />
-	<include name="*.smap" />
-	<include name="*.properties" />
+        <include name="*.java" />
+        <include name="*.tokens" />
+        <include name="*.txt" />
+        <include name="*.g" />
+        <include name="*.smap" />
+        <include name="*.properties" />
       </fileset>
     </delete>
   </target>
@@ -140,21 +140,21 @@
       <mkdir dir="@{destdir}" />
 
       <!-- in some cases, pde.jar was not getting built
-  	 https://github.com/processing/processing/issues/1792 -->
+         https://github.com/processing/processing/issues/1792 -->
       <delete file="${mode_jar}" />
 
       <!-- env used to set classpath below -->
       <property environment="env" />
 
-      <javac source="11"
-  	   target="11"
-  	   destdir="@{destdir}"
-  	   excludes="**/tools/format/**"
-  	   encoding="UTF-8"
-  	   includeAntRuntime="false"
-  	   debug="on"
-  	   nowarn="true"
-  	   compiler="modern">
+      <javac source="17"
+             target="17"
+             destdir="@{destdir}"
+             excludes="**/tools/format/**"
+             encoding="UTF-8"
+             includeAntRuntime="false"
+             debug="on"
+             nowarn="true"
+             compiler="modern">
         <src path="@{srcdir}" />
         <src path="generated" />
         <classpath refid="@{classpath}"/>