diff --git a/src/test/java/net/ladenthin/maven/llamacpp/aiindex/prompt/AiPromptSupportTest.java b/src/test/java/net/ladenthin/maven/llamacpp/aiindex/prompt/AiPromptSupportTest.java
index 1835955..59c9b47 100644
--- a/src/test/java/net/ladenthin/maven/llamacpp/aiindex/prompt/AiPromptSupportTest.java
+++ b/src/test/java/net/ladenthin/maven/llamacpp/aiindex/prompt/AiPromptSupportTest.java
@@ -8,6 +8,7 @@
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
+import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Arrays;
 import java.util.Collections;
@@ -32,7 +33,11 @@ public void buildPromptRendersFileNameAndSource() {
     @Test
     public void buildPromptUsesFullPathWhenFileNameNull() {
         AiPromptSupport support = new AiPromptSupport(Collections.singletonList(def("summary", "[%s] %s")));
-        assertThat(support.buildPrompt("summary", Paths.get("/"), "x"), is("[/] x"));
+        // A root path has a null getFileName() on every OS, so buildPrompt falls back to the full
+        // path string. Derive the expected separator from the same Path so the assertion holds on
+        // Windows too (the root renders with the platform separator: "/" on POSIX, "\" on Windows).
+        Path root = Paths.get("/");
+        assertThat(support.buildPrompt("summary", root, "x"), is("[" + root + "] x"));
     }
 
     @Test
diff --git a/src/test/java/net/ladenthin/maven/llamacpp/aiindex/provider/MockAiGenerationProviderTest.java b/src/test/java/net/ladenthin/maven/llamacpp/aiindex/provider/MockAiGenerationProviderTest.java
index d319aa9..b1f94b9 100644
--- a/src/test/java/net/ladenthin/maven/llamacpp/aiindex/provider/MockAiGenerationProviderTest.java
+++ b/src/test/java/net/ladenthin/maven/llamacpp/aiindex/provider/MockAiGenerationProviderTest.java
@@ -7,6 +7,7 @@
 import static org.hamcrest.MatcherAssert.assertThat;
 
 import java.io.IOException;
+import java.nio.file.Path;
 import java.nio.file.Paths;
 import net.ladenthin.maven.llamacpp.aiindex.document.AiGenerationRequest;
 import net.ladenthin.maven.llamacpp.aiindex.document.AiMdHeader;
@@ -30,9 +31,12 @@ public void generateUsesFileNameOnly() throws IOException {
 
     @Test
     public void generateFallsBackToFullPathWhenFileNameNull() throws IOException {
-        // A root path has a null getFileName(); the provider must use file.toString().
-        AiGenerationRequest request = new AiGenerationRequest("summary", Paths.get("/"), "src", HEADER);
-        assertThat(provider.generate(request), is("Mock summary for /"));
+        // A root path has a null getFileName(); the provider must use file.toString(). Derive the
+        // expected separator from the same Path so the assertion holds on Windows too (the root
+        // renders with the platform separator: "/" on POSIX, "\" on Windows).
+        Path root = Paths.get("/");
+        AiGenerationRequest request = new AiGenerationRequest("summary", root, "src", HEADER);
+        assertThat(provider.generate(request), is("Mock summary for " + root));
     }
 
     @Test