diff --git a/src/com/sun/tools/jmake/ClassFileReader.java b/src/com/sun/tools/jmake/ClassFileReader.java
index aa7c3d5..e1cff84 100644
--- a/src/com/sun/tools/jmake/ClassFileReader.java
+++ b/src/com/sun/tools/jmake/ClassFileReader.java
@@ -26,6 +26,7 @@ public class ClassFileReader extends BinaryFileReader {
     public static final int JDK14_MAJOR_VERSION = 48;
     public static final int JDK15_MAJOR_VERSION = 49;
     public static final int JDK16_MAJOR_VERSION = 50;
+    public static final int JDK17_MAJOR_VERSION = 51;
     public static final int CONSTANT_Utf8 = 1;
     public static final int CONSTANT_Unicode = 2;
     public static final int CONSTANT_Integer = 3;
@@ -71,7 +72,9 @@ private void readPreamble() {
         if (majorVersion > JDK14_MAJOR_VERSION ||
                 versionWord(majorVersion, minorVersion) <
                 versionWord(JAVA_MIN_MAJOR_VERSION, JAVA_MIN_MINOR_VERSION) ) {
-            if (majorVersion == JDK16_MAJOR_VERSION) {
+            if (majorVersion == JDK17_MAJOR_VERSION) {
+                classInfo.javacTargetRelease = Utils.JAVAC_TARGET_RELEASE_17;
+            } else if (majorVersion == JDK16_MAJOR_VERSION) {
                 classInfo.javacTargetRelease = Utils.JAVAC_TARGET_RELEASE_16;
             } else if (majorVersion == JDK15_MAJOR_VERSION) {
                 classInfo.javacTargetRelease = Utils.JAVAC_TARGET_RELEASE_15;
diff --git a/src/com/sun/tools/jmake/Utils.java b/src/com/sun/tools/jmake/Utils.java
index cb660ad..6aa1f07 100644
--- a/src/com/sun/tools/jmake/Utils.java
+++ b/src/com/sun/tools/jmake/Utils.java
@@ -6,15 +6,14 @@
  */
 package com.sun.tools.jmake;
 
-import java.util.zip.ZipFile;
-import java.util.zip.ZipEntry;
-
-import java.io.PrintStream;
 import java.io.File;
+import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.io.FileInputStream;
+import java.io.PrintStream;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
 
 /**
  * Utility functions used by other classes from this package.
@@ -34,6 +33,7 @@ public class Utils {
     static final int JAVAC_TARGET_RELEASE_OLDEST = 0x01040000;  // 1.4 and previous versions
     static final int JAVAC_TARGET_RELEASE_15 = 0x01050000;  // if class is compiled with -target 1.5
     static final int JAVAC_TARGET_RELEASE_16 = 0x01060000;  // if class is compiled with -target 1.6
+    static final int JAVAC_TARGET_RELEASE_17 = 0x01070000;  // if class is compiled with -target 1.7
     static int warningLimit = 20;  // Maximum number of warnings to print
     static final int TIMING_TOTAL = 0;
     static final int TIMING_PDBREAD = 1;