diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -4,6 +4,7 @@
 
 if(BUILD_TESTING)
     find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED Core Test)
+    find_package(KF5CoreAddons ${KF5_VERSION} REQUIRED)
 
     configure_file(testdata.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/testdata.h)
     ecm_add_test(symlinktest.cpp
@@ -16,7 +17,7 @@
     )
     ecm_add_test(dupetest.cpp
         TEST_NAME "dupe"
-        LINK_LIBRARIES Qt5::Test
+        LINK_LIBRARIES Qt5::Test KF5::CoreAddons
     )
     ecm_add_test(scalabletest.cpp
         TEST_NAME "scalable"
diff --git a/autotests/dupetest.cpp b/autotests/dupetest.cpp
--- a/autotests/dupetest.cpp
+++ b/autotests/dupetest.cpp
@@ -1,5 +1,5 @@
 /*
-    Copyright 2016 Harald Sitter <sitter@kde.org>
+    Copyright 2016-2018 Harald Sitter <sitter@kde.org>
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
@@ -20,6 +20,7 @@
 
 #include <QObject>
 #include <QtTest>
+#include <KShell>
 
 #include "testhelpers.h"
 
@@ -32,7 +33,8 @@
         QString line;
         while (proc.canReadLine() || proc.waitForReadyRead()) {
             line = proc.readLine();
-            failListContent(line.simplified().split(QChar(' ')),
+            // Split through KShell so we don't trip over paths with spaces.
+            failListContent(KShell::splitArgs(line.simplified()),
                             "The following files are duplicates but not links:\n");
         }
     }