diff --git a/client/QPCSC.cpp b/client/QPCSC.cpp
index 97830c63..cc8c1204 100644
--- a/client/QPCSC.cpp
+++ b/client/QPCSC.cpp
@@ -59,7 +59,7 @@ static QStringList stateToString(DWORD state)
 }
 
 template<auto Func, typename... Args>
-static auto SCCall(const char *file, int line, const char *function, Args... args)
+constexpr auto SCCall(const char *file, int line, const char *function, Args... args)
 {
 	auto err = Func(args...);
 	if(SCard().isDebugEnabled())
diff --git a/client/QPCSC.h b/client/QPCSC.h
index 20a6fc63..317e862d 100644
--- a/client/QPCSC.h
+++ b/client/QPCSC.h
@@ -61,7 +61,7 @@ class QPCSCReader final: public QObject
 		constexpr operator bool() const { return SW == 0x9000; }
 	};
 
-	enum Properties {
+	enum Properties : quint8 {
 		wLcdLayout					= 0x01,
 		bEntryValidationCondition	= 0x02,
 		bTimeOut2					= 0x03,