diff --git a/core/deployment/src/main/java/io/quarkus/deployment/steps/BannerProcessor.java b/core/deployment/src/main/java/io/quarkus/deployment/steps/BannerProcessor.java
index c30633dccaed2..7fcc656f85508 100644
--- a/core/deployment/src/main/java/io/quarkus/deployment/steps/BannerProcessor.java
+++ b/core/deployment/src/main/java/io/quarkus/deployment/steps/BannerProcessor.java
@@ -2,16 +2,14 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.Paths;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.AbstractMap;
 import java.util.Enumeration;
 import java.util.Map;
 import java.util.Scanner;
-import java.util.jar.JarFile;
 
 import org.jboss.logging.Logger;
 
@@ -103,20 +101,22 @@ private Map.Entry<URL, Boolean> getBanner(BannerConfig config) throws IOExceptio
         }
     }
 
-    private boolean isQuarkusCoreBanner(URL url) throws IOException {
+    protected boolean isQuarkusCoreBanner(URL url) {
         if (!"jar".equals(url.getProtocol())) {
             return false;
         }
 
         String thisClassName = this.getClass().getName();
-        String jarPath = url.getPath().substring(0, url.getPath().lastIndexOf('!'));
 
-        // We determine whether the banner is the default by checking to see if the jar that contains it also
-        // contains this class. This way although somewhat complicated guarantees that any rename of artifacts
-        // won't affect the check
-        try (JarFile jarFile = new JarFile(Paths.get(new URI(jarPath)).toFile())) {
-            return jarFile.getJarEntry(thisClassName.replace('.', '/') + ".class") != null;
-        } catch (URISyntaxException e) {
+        try {
+            return ClassPathUtils.processAsPath(url, p -> {
+                // We determine whether the banner is the default by checking to see if the jar that contains it also
+                // contains this class. This way although somewhat complicated guarantees that any rename of artifacts
+                // won't affect the check
+                Path resolved = p.resolve("/" + thisClassName.replace('.', '/') + ".class");
+                return Files.exists(resolved);
+            });
+        } catch (UncheckedIOException ex) {
             return false;
         }
     }
diff --git a/core/deployment/src/test/java/io/quarkus/deployment/pkg/steps/BannerProcessorTest.java b/core/deployment/src/test/java/io/quarkus/deployment/pkg/steps/BannerProcessorTest.java
new file mode 100644
index 0000000000000..40f0902f86eb8
--- /dev/null
+++ b/core/deployment/src/test/java/io/quarkus/deployment/pkg/steps/BannerProcessorTest.java
@@ -0,0 +1,55 @@
+package io.quarkus.deployment.pkg.steps;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.nio.charset.StandardCharsets;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.junit.jupiter.api.Test;
+
+import io.quarkus.deployment.steps.BannerProcessor;
+import io.quarkus.fs.util.ZipUtils;
+
+public class BannerProcessorTest {
+
+    class MyBannerProcessor extends BannerProcessor {
+        public boolean test(Path path) throws Exception {
+            return this.isQuarkusCoreBanner(path.toUri().toURL());
+        }
+    }
+
+    @Test
+    public void checkQuarkusCoreBannerOnFilesystemWithSpecialCharacters() throws Exception {
+        MyBannerProcessor processor = new MyBannerProcessor();
+
+        assertFalse(processor.test(Paths.get("tmp", "Descărcări", "test", "something!")));
+
+        final Path tmpDir = Files.createTempDirectory("Descărcări");
+        final Path zipPath = tmpDir.resolve("BannerProcessorTest.jar");
+
+        try {
+            try (FileSystem ignored = ZipUtils.newZip(zipPath)) {
+            }
+
+            try (FileSystem fs = ZipUtils.newFileSystem(zipPath)) {
+                assertFalse(processor.test(fs.getPath("/")));
+            }
+
+            try (final FileSystem fs = ZipUtils.newFileSystem(zipPath)) {
+                Path classFile = fs.getPath(MyBannerProcessor.class.getName().replace('.', '/') + ".class");
+                Files.createDirectories(classFile.getParent());
+                Files.write(classFile, "".getBytes(StandardCharsets.UTF_8));
+            }
+
+            try (FileSystem fs = ZipUtils.newFileSystem(zipPath)) {
+                assertTrue(processor.test(fs.getPath("/")));
+            }
+        } finally {
+            Files.deleteIfExists(zipPath);
+        }
+    }
+}