diff --git a/flow-server/src/main/java/com/vaadin/flow/server/frontend/FileIOUtils.java b/flow-server/src/main/java/com/vaadin/flow/server/frontend/FileIOUtils.java
index 597b4cea6ca..5dbe5cbb9ed 100644
--- a/flow-server/src/main/java/com/vaadin/flow/server/frontend/FileIOUtils.java
+++ b/flow-server/src/main/java/com/vaadin/flow/server/frontend/FileIOUtils.java
@@ -126,7 +126,8 @@ static File getProjectFolderFromClasspath(URL rootFolder)
         // URI decodes the path so that e.g. " " works correctly
         // Path.of makes windows paths work correctly
         Path path = Path.of(rootFolder.toURI());
-        if (path.endsWith(Path.of("target", "classes"))) {
+        if (path.endsWith(Path.of("target", "classes"))
+                || path.endsWith(Path.of("target", "test-classes"))) {
             return path.getParent().getParent().toFile();
         }