diff --git a/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp b/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
index 96e28618f49..9fbeb73176f 100644
--- a/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
+++ b/src/plugins/qbsprojectmanager/defaultpropertyprovider.cpp
@@ -242,7 +242,7 @@ QVariantMap DefaultPropertyProvider::autoGeneratedProperties(const ProjectExplor
     QString cCompilerName = cFileInfo.fileName();
     QString cxxCompilerName = cxxFileInfo.fileName();
     const QString cToolchainPrefix = extractToolchainPrefix(&cCompilerName);
-    const QString cxxToolchainPrefix = extractToolchainPrefix(&cCompilerName);
+    const QString cxxToolchainPrefix = extractToolchainPrefix(&cxxCompilerName);
 
     QFileInfo mainFileInfo;
     QString mainCompilerName;