diff --git a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
index 63810fa6e9a..e8ff40b3105 100644
--- a/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeconfigitem.cpp
@@ -194,7 +194,17 @@ QString CMakeConfigItem::expandedValue(const ProjectExplorer::Kit *k) const
 
 QString CMakeConfigItem::expandedValue(const Utils::MacroExpander *expander) const
 {
-    return expander ? expander->expand(QString::fromUtf8(value)) : QString::fromUtf8(value);
+    QString expandedValue = expander ? expander->expand(QString::fromUtf8(value))
+                                     : QString::fromUtf8(value);
+
+    // Make sure we have CMake paths using / instead of \\ on Windows
+    // %{buildDir} returns \\ on Windows
+    if (type == CMakeConfigItem::FILEPATH || type == CMakeConfigItem::PATH) {
+        const FilePaths paths = transform(expandedValue.split(";"), &FilePath::fromUserInput);
+        expandedValue = transform(paths, &FilePath::path).join(";");
+    }
+
+    return expandedValue;
 }
 
 bool CMakeConfigItem::less(const CMakeConfigItem &a, const CMakeConfigItem &b)
@@ -424,9 +434,7 @@ QString CMakeConfigItem::toString(const Utils::MacroExpander *expander) const
         break;
     }
 
-    const QString expandedValue
-            = expander ? expander->expand(QString::fromUtf8(value)) : QString::fromUtf8(value);
-    return QString::fromUtf8(key) + QLatin1Char(':') + typeStr + QLatin1Char('=') + expandedValue;
+    return QString("%1:%2=%3").arg(QString::fromUtf8(key), typeStr, expandedValue(expander));
 }
 
 QString CMakeConfigItem::toArgument() const
diff --git a/src/plugins/cmakeprojectmanager/configmodel.cpp b/src/plugins/cmakeprojectmanager/configmodel.cpp
index e38df5d2a86..953486e2dad 100644
--- a/src/plugins/cmakeprojectmanager/configmodel.cpp
+++ b/src/plugins/cmakeprojectmanager/configmodel.cpp
@@ -101,6 +101,11 @@ CMakeConfigItem ConfigModel::DataItem::toCMakeConfigItem() const
     return cmi;
 }
 
+QString ConfigModel::DataItem::expandedValue(Utils::MacroExpander *expander)
+{
+    return toCMakeConfigItem().expandedValue(expander);
+}
+
 // ConfigModel
 
 ConfigModel::ConfigModel(QObject *parent) : Utils::TreeModel<>(parent)
@@ -165,7 +170,7 @@ void ConfigModel::appendConfiguration(const QString &key,
     if (m_kitConfiguration.contains(key))
         internalItem.kitValue = QString::fromUtf8(
             isInitial ? m_kitConfiguration.value(key).value
-                      : m_macroExpander->expand(m_kitConfiguration.value(key).value));
+                      : m_kitConfiguration.value(key).expandedValue(m_macroExpander).toUtf8());
     m_configuration.append(internalItem);
     setConfiguration(m_configuration);
 }
@@ -504,7 +509,7 @@ void ConfigModel::generateTree()
     for (InternalDataItem &di : m_configuration) {
         auto it = initialHash.find(di.key);
         if (it != initialHash.end())
-            di.initialValue = macroExpander()->expand(it->value);
+            di.initialValue = it->expandedValue(macroExpander());
 
         root->appendChild(new Internal::ConfigModelTreeItem(&di));
     }
diff --git a/src/plugins/cmakeprojectmanager/configmodel.h b/src/plugins/cmakeprojectmanager/configmodel.h
index 95160ee1aae..e70cac3bbec 100644
--- a/src/plugins/cmakeprojectmanager/configmodel.h
+++ b/src/plugins/cmakeprojectmanager/configmodel.h
@@ -36,6 +36,8 @@ public:
 
         CMakeConfigItem toCMakeConfigItem() const;
 
+        QString expandedValue(Utils::MacroExpander *expander);
+
         enum Type { BOOLEAN, FILE, DIRECTORY, STRING, UNKNOWN};
 
         QString key;