diff --git a/jib-core/src/main/java/com/google/cloud/tools/jib/registry/RegistryAuthenticator.java b/jib-core/src/main/java/com/google/cloud/tools/jib/registry/RegistryAuthenticator.java
index f64935de91..bb057fcb64 100644
--- a/jib-core/src/main/java/com/google/cloud/tools/jib/registry/RegistryAuthenticator.java
+++ b/jib-core/src/main/java/com/google/cloud/tools/jib/registry/RegistryAuthenticator.java
@@ -55,8 +55,9 @@ public class RegistryAuthenticator {
   @Nullable
   static RegistryAuthenticator fromAuthenticationMethod(
       String authenticationMethod, String repository) throws RegistryAuthenticationFailedException {
-    // If the authentication method starts with 'Basic ', no registry authentication is needed.
-    if (authenticationMethod.matches("^Basic .*")) {
+    // If the authentication method starts with 'basic ' (case insensitive), no registry
+    // authentication is needed.
+    if (authenticationMethod.matches("^(?i)(basic) .*")) {
       return null;
     }
 
diff --git a/jib-core/src/test/java/com/google/cloud/tools/jib/registry/RegistryAuthenticatorTest.java b/jib-core/src/test/java/com/google/cloud/tools/jib/registry/RegistryAuthenticatorTest.java
index 0d661afc3b..9fda0ddfb1 100644
--- a/jib-core/src/test/java/com/google/cloud/tools/jib/registry/RegistryAuthenticatorTest.java
+++ b/jib-core/src/test/java/com/google/cloud/tools/jib/registry/RegistryAuthenticatorTest.java
@@ -42,6 +42,16 @@ public void testFromAuthenticationMethod_basic() throws RegistryAuthenticationFa
         RegistryAuthenticator.fromAuthenticationMethod(
             "Basic realm=\"https://somerealm\",service=\"someservice\",scope=\"somescope\"",
             "someimage"));
+
+    Assert.assertNull(
+        RegistryAuthenticator.fromAuthenticationMethod(
+            "BASIC realm=\"https://somerealm\",service=\"someservice\",scope=\"somescope\"",
+            "someimage"));
+
+    Assert.assertNull(
+        RegistryAuthenticator.fromAuthenticationMethod(
+            "bASIC realm=\"https://somerealm\",service=\"someservice\",scope=\"somescope\"",
+            "someimage"));
   }
 
   @Test