diff --git a/src/test/java/com/google/devtools/build/lib/vfs/ScopeEscapableFileSystemTest.java b/src/test/java/com/google/devtools/build/lib/vfs/ScopeEscapableFileSystemTest.java
index 719ffde..87c4cce 100644
--- a/src/test/java/com/google/devtools/build/lib/vfs/ScopeEscapableFileSystemTest.java
+++ b/src/test/java/com/google/devtools/build/lib/vfs/ScopeEscapableFileSystemTest.java
@@ -85,6 +85,7 @@
     @Override protected boolean isWritable(Path path) { throw re(); }
     @Override protected boolean isDirectory(Path path, boolean followSymlinks) { throw re(); }
     @Override protected boolean isFile(Path path, boolean followSymlinks) { throw re(); }
+    @Override protected boolean isSpecialFile(Path path, boolean followSymlinks) { throw re(); }
     @Override protected boolean isExecutable(Path path) { throw re(); }
     @Override protected boolean exists(Path path, boolean followSymlinks) {throw re(); }
     @Override protected boolean isSymbolicLink(Path path) { throw re(); }
diff --git a/src/test/java/com/google/devtools/build/lib/vfs/UnixFileSystemTest.java b/src/test/java/com/google/devtools/build/lib/vfs/UnixFileSystemTest.java
index cb5685e..40ace2b 100644
--- a/src/test/java/com/google/devtools/build/lib/vfs/UnixFileSystemTest.java
+++ b/src/test/java/com/google/devtools/build/lib/vfs/UnixFileSystemTest.java
@@ -15,8 +15,10 @@
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
+import com.google.devtools.build.lib.unix.FilesystemUtils;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
@@ -60,4 +62,20 @@
       // Expected.
     }
   }
+
+  @Test
+  public void testIsSpecialFile() throws Exception {
+    Path regular = absolutize("regular");
+    Path fifo = absolutize("fifo");
+    FileSystemUtils.createEmptyFile(regular);
+    FilesystemUtils.mkfifo(fifo.toString(), 0777);
+    assertTrue(regular.isFile());
+    assertFalse(regular.isSpecialFile());
+    assertTrue(regular.stat().isFile());
+    assertFalse(regular.stat().isSpecialFile());
+    assertTrue(fifo.isFile());
+    assertTrue(fifo.isSpecialFile());
+    assertTrue(fifo.stat().isFile());
+    assertTrue(fifo.stat().isSpecialFile());
+  }
 }