diff --git a/src/plugins/qbsprojectmanager/qbsbuildconfiguration.cpp b/src/plugins/qbsprojectmanager/qbsbuildconfiguration.cpp
index 94555e802c8..5f4c8341b6b 100644
--- a/src/plugins/qbsprojectmanager/qbsbuildconfiguration.cpp
+++ b/src/plugins/qbsprojectmanager/qbsbuildconfiguration.cpp
@@ -372,7 +372,7 @@ QString QbsBuildConfiguration::equivalentCommandLine(const BuildStep *buildStep)
     const QString profileName = QbsManager::instance()->profileForKit(buildStep->target()->kit());
     const QString buildVariant = qbsConfiguration()
             .value(QLatin1String(Constants::QBS_CONFIG_VARIANT_KEY)).toString();
-    Utils::QtcProcess::addArg(&commandLine, configurationName());
+    Utils::QtcProcess::addArg(&commandLine, QLatin1String("config:") + configurationName());
     Utils::QtcProcess::addArg(&commandLine, QLatin1String(Constants::QBS_CONFIG_VARIANT_KEY)
                                   + QLatin1Char(':') + buildVariant);
     const Utils::FileName installRoot = stepProxy.installRoot();
diff --git a/src/plugins/qbsprojectmanager/qbsbuildstep.cpp b/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
index 7b2e024f3e6..ffe80df75f4 100644
--- a/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
+++ b/src/plugins/qbsprojectmanager/qbsbuildstep.cpp
@@ -634,7 +634,7 @@ void QbsBuildStepConfigWidget::updateState()
     }
 
     if (m_step->isQmlDebuggingEnabled())
-        command.append(Constants::QBS_CONFIG_QUICK_DEBUG_KEY).append(":true");
+        command.append(' ').append(Constants::QBS_CONFIG_QUICK_DEBUG_KEY).append(":true");
     m_ui->commandLineTextEdit->setPlainText(command);
 
     QString summary = tr("<b>Qbs:</b> %1").arg(command);