diff --git a/src/electronic-ids/pcsc/pcsc-common.hpp b/src/electronic-ids/pcsc/pcsc-common.hpp
index f5af624..3d19cdb 100644
--- a/src/electronic-ids/pcsc/pcsc-common.hpp
+++ b/src/electronic-ids/pcsc/pcsc-common.hpp
@@ -43,7 +43,7 @@ inline pcsc_cpp::byte_vector getCertificate(pcsc_cpp::SmartCard& card,
     return readBinary(card, length, MAX_LE_VALUE);
 }
 
-inline pcsc_cpp::byte_vector addPaddingToPin(pcsc_cpp::byte_vector&& pin, size_t paddingLength,
+constexpr pcsc_cpp::byte_vector addPaddingToPin(pcsc_cpp::byte_vector&& pin, size_t paddingLength,
                                              pcsc_cpp::byte_type paddingChar)
 {
     pin.resize(std::max(pin.size(), paddingLength), paddingChar);