diff --git a/src/plugins/clangtools/clangtoolruncontrol.cpp b/src/plugins/clangtools/clangtoolruncontrol.cpp
index 4cf49a46385..82c2ba0b38c 100644
--- a/src/plugins/clangtools/clangtoolruncontrol.cpp
+++ b/src/plugins/clangtools/clangtoolruncontrol.cpp
@@ -258,10 +258,10 @@ QList<RunnerCreator> ClangToolRunWorker::runnerCreators()
 {
     QList<RunnerCreator> creators;
 
-    if (m_diagnosticConfig.clangTidyChecks() != "-*")
+    if (m_diagnosticConfig.isClangTidyEnabled())
         creators << [this]() { return createRunner<ClangTidyRunner>(); };
 
-    if (!m_diagnosticConfig.clazyChecks().isEmpty()) {
+    if (m_diagnosticConfig.isClazyEnabled()) {
         if (!qEnvironmentVariable("QTC_USE_CLAZY_STANDALONE_PATH").isEmpty())
             creators << [this]() { return createRunner<ClazyStandaloneRunner>(); };
         else
diff --git a/src/plugins/clangtools/clangtoolssettings.cpp b/src/plugins/clangtools/clangtoolssettings.cpp
index fa2e48c844b..cbd15f512fc 100644
--- a/src/plugins/clangtools/clangtoolssettings.cpp
+++ b/src/plugins/clangtools/clangtoolssettings.cpp
@@ -118,7 +118,7 @@ ClangDiagnosticConfigs importDiagnosticConfigsFromCodeModel()
     ClangDiagnosticConfigs clangOnlyConfigs;
     std::tie(tidyClazyConfigs, clangOnlyConfigs)
         = Utils::partition(configs, [](const ClangDiagnosticConfig &config) {
-              return !config.clazyChecks().isEmpty() || config.clangTidyChecks() != "-*";
+              return config.isClazyEnabled() || config.isClangTidyEnabled();
           });
 
     if (!tidyClazyConfigs.isEmpty()) {
diff --git a/src/plugins/cpptools/clangdiagnosticconfig.cpp b/src/plugins/cpptools/clangdiagnosticconfig.cpp
index 32ef607b1a7..7b318a61f9a 100644
--- a/src/plugins/cpptools/clangdiagnosticconfig.cpp
+++ b/src/plugins/cpptools/clangdiagnosticconfig.cpp
@@ -130,6 +130,11 @@ void ClangDiagnosticConfig::setClangTidyChecks(const QString &checks)
     m_clangTidyChecks = checks;
 }
 
+bool ClangDiagnosticConfig::isClangTidyEnabled() const
+{
+    return m_clangTidyMode != TidyMode::UseCustomChecks || clangTidyChecks() != "-*";
+}
+
 QString ClangDiagnosticConfig::clazyChecks() const
 {
     return m_clazyChecks;
@@ -140,6 +145,11 @@ void ClangDiagnosticConfig::setClazyChecks(const QString &checks)
     m_clazyChecks = checks;
 }
 
+bool ClangDiagnosticConfig::isClazyEnabled() const
+{
+    return m_clazyMode != ClazyMode::UseCustomChecks || !m_clazyChecks.isEmpty();
+}
+
 static QString convertToNewClazyChecksFormat(const QString &checks)
 {
     // Before Qt Creator 4.9 valid values for checks were: "", "levelN".
diff --git a/src/plugins/cpptools/clangdiagnosticconfig.h b/src/plugins/cpptools/clangdiagnosticconfig.h
index c0cf48cdec3..76f5983c1de 100644
--- a/src/plugins/cpptools/clangdiagnosticconfig.h
+++ b/src/plugins/cpptools/clangdiagnosticconfig.h
@@ -71,6 +71,8 @@ public:
     QString clangTidyChecks() const;
     void setClangTidyChecks(const QString &checks);
 
+    bool isClangTidyEnabled() const;
+
     // Clazy
     enum class ClazyMode
     {
@@ -83,6 +85,8 @@ public:
     QString clazyChecks() const;
     void setClazyChecks(const QString &checks);
 
+    bool isClazyEnabled() const;
+
     bool operator==(const ClangDiagnosticConfig &other) const;
     bool operator!=(const ClangDiagnosticConfig &other) const;