diff --git a/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp b/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
index 4f373b8ee34..d8f380e3b6f 100644
--- a/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
+++ b/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
@@ -353,7 +353,8 @@ QVariantMap DefaultPropertyProvider::autoGeneratedProperties(const ProjectExplor
                 data.insert(QLatin1String(CPP_CXXCOMPILERNAME), cxxCompilerName);
         }
 
-        if (tcC && tcCxx && cFileInfo.absolutePath() != cxxFileInfo.absolutePath()) {
+        if (tcC && tcCxx && !cCompilerPath.isEmpty() && !cxxCompilerPath.isEmpty()
+                && cFileInfo.absolutePath() != cxxFileInfo.absolutePath()) {
             Core::MessageManager::write(tr("C and C++ compiler paths differ. C compiler may not work."),
                                         Core::MessageManager::ModeSwitch);
         }