diff --git a/gui/projectfile.cpp b/gui/projectfile.cpp
index 025f5c2a9..84fa81a01 100644
--- a/gui/projectfile.cpp
+++ b/gui/projectfile.cpp
@@ -25,42 +25,42 @@
 #include "projectfile.h"
 #include "common.h"
 
-static const char ProjectElementName[] = "project";
-static const char ProjectVersionAttrib[] = "version";
-static const char ProjectFileVersion[] = "1";
-static const char BuildDirElementName[] = "builddir";
-static const char ImportProjectElementName[] = "importproject";
-static const char AnalyzeAllVsConfigsElementName[] = "analyze-all-vs-configs";
-static const char IncludeDirElementName[] = "includedir";
-static const char DirElementName[] = "dir";
-static const char DirNameAttrib[] = "name";
-static const char DefinesElementName[] = "defines";
-static const char DefineName[] = "define";
-static const char DefineNameAttrib[] = "name";
-static const char UndefinesElementName[] = "undefines";
-static const char UndefineName[] = "undefine";
-static const char PathsElementName[] = "paths";
-static const char PathName[] = "dir";
-static const char PathNameAttrib[] = "name";
-static const char RootPathName[] = "root";
-static const char RootPathNameAttrib[] = "name";
-static const char IgnoreElementName[] = "ignore";
-static const char IgnorePathName[] = "path";
-static const char IgnorePathNameAttrib[] = "name";
-static const char ExcludeElementName[] = "exclude";
-static const char ExcludePathName[] = "path";
-static const char ExcludePathNameAttrib[] = "name";
-static const char LibrariesElementName[] = "libraries";
-static const char LibraryElementName[] = "library";
-static const char PlatformElementName[] = "platform";
-static const char SuppressionsElementName[] = "suppressions";
-static const char SuppressionElementName[] = "suppression";
-static const char AddonElementName[] = "addon";
-static const char AddonsElementName[] = "addons";
-static const char ToolElementName[] = "tool";
-static const char ToolsElementName[] = "tools";
-static const char TagsElementName[] = "tags";
-static const char TagElementName[] = "tag";
+static constexpr char ProjectElementName[] = "project";
+static constexpr char ProjectVersionAttrib[] = "version";
+static constexpr char ProjectFileVersion[] = "1";
+static constexpr char BuildDirElementName[] = "builddir";
+static constexpr char ImportProjectElementName[] = "importproject";
+static constexpr char AnalyzeAllVsConfigsElementName[] = "analyze-all-vs-configs";
+static constexpr char IncludeDirElementName[] = "includedir";
+static constexpr char DirElementName[] = "dir";
+static constexpr char DirNameAttrib[] = "name";
+static constexpr char DefinesElementName[] = "defines";
+static constexpr char DefineName[] = "define";
+static constexpr char DefineNameAttrib[] = "name";
+static constexpr char UndefinesElementName[] = "undefines";
+static constexpr char UndefineName[] = "undefine";
+static constexpr char PathsElementName[] = "paths";
+static constexpr char PathName[] = "dir";
+static constexpr char PathNameAttrib[] = "name";
+static constexpr char RootPathName[] = "root";
+static constexpr char RootPathNameAttrib[] = "name";
+static constexpr char IgnoreElementName[] = "ignore";
+static constexpr char IgnorePathName[] = "path";
+static constexpr char IgnorePathNameAttrib[] = "name";
+static constexpr char ExcludeElementName[] = "exclude";
+static constexpr char ExcludePathName[] = "path";
+static constexpr char ExcludePathNameAttrib[] = "name";
+static constexpr char LibrariesElementName[] = "libraries";
+static constexpr char LibraryElementName[] = "library";
+static constexpr char PlatformElementName[] = "platform";
+static constexpr char SuppressionsElementName[] = "suppressions";
+static constexpr char SuppressionElementName[] = "suppression";
+static constexpr char AddonElementName[] = "addon";
+static constexpr char AddonsElementName[] = "addons";
+static constexpr char ToolElementName[] = "tool";
+static constexpr char ToolsElementName[] = "tools";
+static constexpr char TagsElementName[] = "tags";
+static constexpr char TagElementName[] = "tag";
 static constexpr char CheckHeadersElementName[] = "check-headers";
 static constexpr char CheckUnusedTemplatesElementName[] = "check-unused-templates";
 static constexpr char MaxCtuDepthElementName[] = "max-ctu-depth";