diff --git a/src/plugins/clangtools/clangtoolsunittests.cpp b/src/plugins/clangtools/clangtoolsunittests.cpp
index 1e76c577e13..512e6e71355 100644
--- a/src/plugins/clangtools/clangtoolsunittests.cpp
+++ b/src/plugins/clangtools/clangtoolsunittests.cpp
@@ -125,7 +125,7 @@ void ClangToolsUnitTests::testProject()
                     ClangToolsSettings::instance()->runSettings(),
                     diagnosticConfig);
     QSignalSpy waitForFinishedTool(tool, &ClangTool::finished);
-    QVERIFY(waitForFinishedTool.wait(90000));
+    QVERIFY(waitForFinishedTool.wait(m_timeout));
 
     // Check for errors
     const QString errorText = waitForFinishedTool.takeFirst().first().toString();
@@ -186,5 +186,11 @@ void ClangToolsUnitTests::addTestRow(const QByteArray &relativeFilePath,
         << absoluteFilePath << expectedDiagCount << diagnosticConfig;
 }
 
+int ClangToolsUnitTests::getTimeout()
+{
+    const int t = qEnvironmentVariableIntValue("QTC_CLANGTOOLS_TEST_TIMEOUT");
+    return t > 0 ? t : 480000;
+}
+
 } // namespace Internal
 } // namespace ClangTools
diff --git a/src/plugins/clangtools/clangtoolsunittests.h b/src/plugins/clangtools/clangtoolsunittests.h
index 87dd5a114e6..20da247894f 100644
--- a/src/plugins/clangtools/clangtoolsunittests.h
+++ b/src/plugins/clangtools/clangtoolsunittests.h
@@ -56,8 +56,11 @@ private:
                     const CppTools::ClangDiagnosticConfig &diagnosticConfig);
 
 private:
+    static int getTimeout();
+
     CppTools::Tests::TemporaryCopiedDir *m_tmpDir = nullptr;
     ProjectExplorer::Kit *m_kit = nullptr;
+    int m_timeout = getTimeout();
 };
 
 } // namespace Internal