diff --git a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/Launcher.java b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/Launcher.java
index 5130b22fe19..0f8991a30ca 100644
--- a/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/Launcher.java
+++ b/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/Launcher.java
@@ -18,6 +18,7 @@ package org.springframework.boot.loader;
 
 import java.io.File;
 import java.lang.reflect.Constructor;
+import java.net.URI;
 import java.net.URL;
 import java.security.CodeSource;
 import java.security.ProtectionDomain;
@@ -67,13 +68,12 @@ public abstract class Launcher {
 	protected void launch(String[] args, ProtectionDomain protectionDomain)
 			throws Exception {
 		CodeSource codeSource = protectionDomain.getCodeSource();
-		URL codeSourceLocation = (codeSource == null ? null : codeSource.getLocation());
-		String codeSourcePath = (codeSourceLocation == null ? null : codeSourceLocation
-				.getPath());
-		if (codeSourcePath == null) {
+		URI location = (codeSource == null ? null : codeSource.getLocation().toURI());
+		String path = (location == null ? null : location.getPath());
+		if (path == null) {
 			throw new IllegalStateException("Unable to determine code source archive");
 		}
-		File root = new File(codeSourcePath);
+		File root = new File(path);
 		if (!root.exists()) {
 			throw new IllegalStateException(
 					"Unable to determine code source archive from " + root);
diff --git a/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/ExplodedArchiveTests.java b/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/ExplodedArchiveTests.java
index ac226d176bd..8210e10de7c 100644
--- a/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/ExplodedArchiveTests.java
+++ b/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/ExplodedArchiveTests.java
@@ -109,7 +109,7 @@ public class ExplodedArchiveTests {
 		Entry entry = getEntriesMap(this.archive).get("nested.jar");
 		Archive nested = this.archive.getNestedArchive(entry);
 		assertThat(nested.getUrl().toString(),
-				equalTo("jar:file:" + this.rootFolder.getPath() + "/nested.jar!/"));
+				equalTo("jar:file:" + this.rootFolder.getPath() + File.separator + "nested.jar!/"));
 	}
 
 	@Test
@@ -119,7 +119,7 @@ public class ExplodedArchiveTests {
 		Map<String, Entry> nestedEntries = getEntriesMap(nested);
 		assertThat(nestedEntries.size(), equalTo(1));
 		assertThat(nested.getUrl().toString(),
-				equalTo("file:" + this.rootFolder.getPath() + "/d/"));
+				equalTo("file:" + this.rootFolder.getPath() + File.separator + "d/"));
 	}
 
 	@Test