diff --git a/build.gradle.kts b/build.gradle.kts
index 579d4bd907b..0f4ff553db4 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -826,6 +826,7 @@ allprojects {
                 passProperty("user.country", "tr")
                 passProperty("user.timezone", "UTC")
                 passProperty("calcite.avatica.version", props.string("calcite.avatica.version"))
+                passProperty("gradle.rootDir", rootDir.toString())
                 val props = System.getProperties()
                 for (e in props.propertyNames() as `java.util`.Enumeration<String>) {
                     if (e.startsWith("calcite.") || e.startsWith("avatica.")) {
diff --git a/core/src/test/java/org/apache/calcite/test/LintTest.java b/core/src/test/java/org/apache/calcite/test/LintTest.java
index 1e36cfd020e..5ba82b42501 100644
--- a/core/src/test/java/org/apache/calcite/test/LintTest.java
+++ b/core/src/test/java/org/apache/calcite/test/LintTest.java
@@ -37,6 +37,8 @@
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
@@ -46,10 +48,6 @@
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
-import static com.google.common.collect.Iterables.getOnlyElement;
-
-import static org.apache.calcite.util.Util.filter;
-
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.empty;
@@ -64,6 +62,7 @@ class LintTest {
    * space. */
   private static final Pattern CALCITE_PATTERN =
       Pattern.compile("^(\\[CALCITE-[0-9]{1,4}][ ]).*");
+  private static final Path ROOT_PATH = Paths.get(System.getProperty("gradle.rootDir"));
 
   @SuppressWarnings("Convert2MethodRef") // JDK 8 requires lambdas
   private Puffin.Program<GlobalState> makeProgram() {
@@ -397,10 +396,7 @@ private static void checkMessage(String subject, String body,
   /** Ensures that the {@code contributors.yml} file is sorted by name. */
   @Test void testContributorsFileIsSorted() throws IOException {
     final ObjectMapper mapper = new YAMLMapper();
-    final List<File> files = TestUnsafe.getTextFiles();
-    final File contributorsFile =
-        getOnlyElement(
-            filter(files, f -> f.getName().equals("contributors.yml")));
+    final File contributorsFile = ROOT_PATH.resolve("site/_data/contributors.yml").toFile();
     JavaType listType =
         mapper.getTypeFactory()
             .constructCollectionType(List.class, Contributor.class);
@@ -416,12 +412,9 @@ private static void checkMessage(String subject, String body,
 
   /** Ensures that the {@code .mailmap} file is sorted. */
   @Test void testMailmapFile() {
-    final List<File> files = TestUnsafe.getTextFiles();
-    final File contributorsFile =
-        getOnlyElement(
-            filter(files, f -> f.getName().equals(".mailmap")));
+    final File mailmapFile = ROOT_PATH.resolve(".mailmap").toFile();
     final List<String> lines = new ArrayList<>();
-    forEachLineIn(contributorsFile, line -> {
+    forEachLineIn(mailmapFile, line -> {
       if (!line.startsWith("#")) {
         lines.add(line);
       }