diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 178f78bde..11c75d2cd 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -167,11 +167,10 @@ string baseNameOf(const Path & path)
 
 bool isInDir(const Path & path, const Path & dir)
 {
-    return dir == "/"
-        || (path[0] == '/'
-            && string(path, 0, dir.size()) == dir
-            && path.size() >= dir.size() + 2
-            && path[dir.size()] == '/');
+    return path[0] == '/'
+        && string(path, 0, dir.size()) == dir
+        && path.size() >= dir.size() + 2
+        && path[dir.size()] == '/';
 }