diff --git a/dist/index.js b/dist/index.js
index 2634606..36a56bb 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -4742,6 +4742,7 @@ function getJava(version, arch, jdkFile, javaPackage) {
             toolPath = yield tc.cacheDir(jdkDir, javaPackage, getCacheVersionString(version), arch);
         }
         let extendedJavaHome = 'JAVA_HOME_' + version + '_' + arch;
+        extendedJavaHome = extendedJavaHome.toUpperCase().replace(/[^0-9A-Z_]/g, '_');
         core.exportVariable('JAVA_HOME', toolPath);
         core.exportVariable(extendedJavaHome, toolPath);
         core.addPath(path.join(toolPath, 'bin'));
diff --git a/src/installer.ts b/src/installer.ts
index 487db6f..7a8feae 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -87,6 +87,7 @@ export async function getJava(
   }
 
   let extendedJavaHome = 'JAVA_HOME_' + version + '_' + arch;
+  extendedJavaHome = extendedJavaHome.toUpperCase().replace(/[^0-9A-Z_]/g, '_');
   core.exportVariable('JAVA_HOME', toolPath);
   core.exportVariable(extendedJavaHome, toolPath);
   core.addPath(path.join(toolPath, 'bin'));