diff --git a/x-pack/plugin/security/cli/src/test/java/org/elasticsearch/xpack/security/cli/HttpCertificateCommandTests.java b/x-pack/plugin/security/cli/src/test/java/org/elasticsearch/xpack/security/cli/HttpCertificateCommandTests.java
index 284a5dbb481..1021d5af55a 100644
--- a/x-pack/plugin/security/cli/src/test/java/org/elasticsearch/xpack/security/cli/HttpCertificateCommandTests.java
+++ b/x-pack/plugin/security/cli/src/test/java/org/elasticsearch/xpack/security/cli/HttpCertificateCommandTests.java
@@ -9,6 +9,7 @@ package org.elasticsearch.xpack.security.cli;
 import com.google.common.jimfs.Configuration;
 import com.google.common.jimfs.Jimfs;
 import joptsimple.OptionSet;
+import org.apache.lucene.util.Constants;
 import org.bouncycastle.asn1.DERIA5String;
 import org.bouncycastle.asn1.DEROctetString;
 import org.bouncycastle.asn1.DERSequence;
@@ -536,6 +537,7 @@ public class HttpCertificateCommandTests extends ESTestCase {
     }
 
     public void testTextFileSubstitutions() throws Exception {
+        assumeFalse("https://github.com/elastic/elasticsearch/issues/50964", Constants.WINDOWS);
         CheckedBiFunction<String, Map<String, String>, String, Exception> copy = (source, subs) -> {
             try (InputStream in = new ByteArrayInputStream(source.getBytes(StandardCharsets.UTF_8));
                  StringWriter out = new StringWriter();