diff --git a/src/json_filter.cpp b/src/json_filter.cpp
index 9c363af..b4ca9e1 100644
--- a/src/json_filter.cpp
+++ b/src/json_filter.cpp
@@ -1,6 +1,6 @@
 #include "json_filter.h"
 
-__attribute__((always_inline)) inline bool Contains(std::string_view str, const std::string &val)
+constexpr bool Contains(std::string_view str, const std::string &val)
 {
     return str.find(val) != std::string::npos;
 }
diff --git a/src/user_filter.cpp b/src/user_filter.cpp
index 95d6bad..ed4fa9c 100644
--- a/src/user_filter.cpp
+++ b/src/user_filter.cpp
@@ -1,6 +1,6 @@
 #include "user_filter.h"
 
-inline bool ValidUsername(const std::string &name) noexcept
+constexpr bool ValidUsername(const std::string &name) noexcept
 {
     if (name.size() < min_name_size || name.size() > max_name_size)
     {