diff --git a/src/plugins/cpptools/cppmodelmanager.cpp b/src/plugins/cpptools/cppmodelmanager.cpp
index 971276f70aa..d4f8c96f81b 100644
--- a/src/plugins/cpptools/cppmodelmanager.cpp
+++ b/src/plugins/cpptools/cppmodelmanager.cpp
@@ -61,6 +61,8 @@
 #include <cplusplus/ASTPath.h>
 #include <cplusplus/TypeOfExpression.h>
 #include <extensionsystem/pluginmanager.h>
+#include <projectexplorer/kitinformation.h>
+#include <projectexplorer/kitmanager.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/projectexplorer.h>
 #include <projectexplorer/projectmacro.h>
@@ -90,6 +92,7 @@ static const bool DumpProjectInfo = qgetenv("QTC_DUMP_PROJECT_INFO") == "1";
 using namespace CppTools;
 using namespace CppTools::Internal;
 using namespace CPlusPlus;
+using namespace ProjectExplorer;
 
 #ifdef QTCREATOR_WITH_DUMP_AST
 
@@ -1276,6 +1279,19 @@ ProjectPart::Ptr CppModelManager::fallbackProjectPart()
         Utils::LanguageExtension::ObjectiveC);
 
     part->qtVersion = Utils::QtVersion::Qt5;
+
+    // TODO: Use different fallback toolchain for different kinds of files
+    const auto * const defaultKit = KitManager::defaultKit();
+    const ToolChain * const defaultTc = ToolChainKitAspect::cxxToolChain(defaultKit);
+    if (defaultKit && defaultTc) {
+        Utils::FilePath sysroot = SysRootKitAspect::sysRoot(defaultKit);
+        if (sysroot.isEmpty())
+            sysroot = Utils::FilePath::fromString(defaultTc->sysRoot());
+        Utils::Environment env = Utils::Environment::systemEnvironment();
+        defaultKit->addToEnvironment(env);
+        ToolChainInfo tcInfo(defaultTc, sysroot.toString(), env);
+        part->setupToolchainProperties(tcInfo, {});
+    }
     part->updateLanguageFeatures();
 
     return part;
diff --git a/src/plugins/cpptools/cppprojectinfogenerator.cpp b/src/plugins/cpptools/cppprojectinfogenerator.cpp
index f5da863a33c..cf3152163f7 100644
--- a/src/plugins/cpptools/cppprojectinfogenerator.cpp
+++ b/src/plugins/cpptools/cppprojectinfogenerator.cpp
@@ -196,51 +196,10 @@ ProjectPart::Ptr ProjectInfoGenerator::createProjectPart(
     ProjectPart::Ptr part(templateProjectPart->copy());
     part->displayName = partName;
     part->files = projectFiles;
-    part->toolchainType = tcInfo.type;
-    part->isMsvc2015Toolchain = tcInfo.isMsvc2015ToolChain;
-    part->toolChainWordWidth = tcInfo.wordWidth == 64 ? ProjectPart::WordWidth64Bit
-                                                      : ProjectPart::WordWidth32Bit;
-    part->toolChainInstallDir = tcInfo.installDir;
-    part->toolChainTargetTriple = tcInfo.targetTriple;
-    part->extraCodeModelFlags = tcInfo.extraCodeModelFlags;
-    part->compilerFlags = flags.commandLineFlags;
     part->warningFlags = flags.warningFlags;
-    if (part->includedFiles.isEmpty()) {
-        // The project manager did not provide the included files, so take
-        // the ones we were able to detect from the toolchain's command line.
-        part->includedFiles = flags.includedFiles;
-    }
     part->language = language;
-    part->languageExtensions = flags.languageExtensions;
-
-    // Toolchain macros and language version
-    if (tcInfo.macroInspectionRunner) {
-        auto macroInspectionReport = tcInfo.macroInspectionRunner(flags.commandLineFlags);
-        part->toolChainMacros = macroInspectionReport.macros;
-        part->languageVersion = macroInspectionReport.languageVersion;
-    // No compiler set in kit.
-    } else if (language == Language::C) {
-        part->languageVersion = Utils::LanguageVersion::LatestC;
-    } else {
-        part->languageVersion = Utils::LanguageVersion::LatestCxx;
-    }
-
-    // Header paths
-    if (tcInfo.headerPathsRunner) {
-        const HeaderPaths builtInHeaderPaths
-            = tcInfo.headerPathsRunner(flags.commandLineFlags,
-                                       tcInfo.sysRootPath,
-                                       tcInfo.targetTriple);
-
-        HeaderPaths &headerPaths = part->headerPaths;
-        for (const HeaderPath &header : builtInHeaderPaths) {
-            const HeaderPath headerPath{header.path, header.type};
-            if (!headerPaths.contains(headerPath))
-                headerPaths.push_back(headerPath);
-        }
-    }
-
-    part->languageExtensions |= languageExtensions;
+    part->languageExtensions = flags.languageExtensions | languageExtensions;
+    part->setupToolchainProperties(tcInfo, flags.commandLineFlags);
     part->updateLanguageFeatures();
 
     return part;
diff --git a/src/plugins/cpptools/projectpart.cpp b/src/plugins/cpptools/projectpart.cpp
index f88fefac82a..d3d4668a814 100644
--- a/src/plugins/cpptools/projectpart.cpp
+++ b/src/plugins/cpptools/projectpart.cpp
@@ -31,6 +31,8 @@
 #include <QDir>
 #include <QTextStream>
 
+using namespace ProjectExplorer;
+
 namespace CppTools {
 
 void ProjectPart::updateLanguageFeatures()
@@ -53,6 +55,41 @@ void ProjectPart::updateLanguageFeatures()
     }
 }
 
+void ProjectPart::setupToolchainProperties(const ToolChainInfo &tcInfo, const QStringList &flags)
+{
+    toolchainType = tcInfo.type;
+    isMsvc2015Toolchain = tcInfo.isMsvc2015ToolChain;
+    toolChainWordWidth = tcInfo.wordWidth == 64 ? ProjectPart::WordWidth64Bit
+                                                : ProjectPart::WordWidth32Bit;
+    toolChainInstallDir = tcInfo.installDir;
+    toolChainTargetTriple = tcInfo.targetTriple;
+    extraCodeModelFlags = tcInfo.extraCodeModelFlags;
+    compilerFlags = flags;
+
+    // Toolchain macros and language version
+    if (tcInfo.macroInspectionRunner) {
+        const auto macroInspectionReport = tcInfo.macroInspectionRunner(compilerFlags);
+        toolChainMacros = macroInspectionReport.macros;
+        languageVersion = macroInspectionReport.languageVersion;
+    // No compiler set in kit.
+    } else if (language == Utils::Language::C) {
+        languageVersion = Utils::LanguageVersion::LatestC;
+    } else {
+        languageVersion = Utils::LanguageVersion::LatestCxx;
+    }
+
+    // Header paths
+    if (tcInfo.headerPathsRunner) {
+        const HeaderPaths builtInHeaderPaths
+                = tcInfo.headerPathsRunner(compilerFlags, tcInfo.sysRootPath, tcInfo.targetTriple);
+        for (const HeaderPath &header : builtInHeaderPaths) {
+            const HeaderPath headerPath{header.path, header.type};
+            if (!headerPaths.contains(headerPath))
+                headerPaths.push_back(headerPath);
+        }
+    }
+}
+
 ProjectPart::Ptr ProjectPart::copy() const
 {
     return Ptr(new ProjectPart(*this));
diff --git a/src/plugins/cpptools/projectpart.h b/src/plugins/cpptools/projectpart.h
index 2f38563687c..010a21a3120 100644
--- a/src/plugins/cpptools/projectpart.h
+++ b/src/plugins/cpptools/projectpart.h
@@ -65,6 +65,8 @@ public:
 
     Ptr copy() const;
     void updateLanguageFeatures();
+    void setupToolchainProperties(const ProjectExplorer::ToolChainInfo &tcInfo,
+                                  const QStringList &flags);
 
     static QByteArray readProjectConfigFile(const Ptr &projectPart);