diff --git a/argument.cpp b/argument.cpp
index 2720da9..86cc31b 100644
--- a/argument.cpp
+++ b/argument.cpp
@@ -28,12 +28,6 @@
 
 const std::string ArgumentParser::true_string = "true";
 
-const option ArgumentParser::options[] = {
-    {"path", required_argument, nullptr, 'p'},
-    {"help", no_argument, nullptr, 'h'},
-    {0, 0, 0, 0},
-};
-
 ArgumentParser::ArgumentParser(int argc, char** argv)
 {
     int option = 0;
@@ -46,7 +40,7 @@
             exit(-1);
         }
 
-        auto i = &options[0];
+        const auto* i = &options[0];
         while ((i->val != option) && (i->val != 0))
             ++i;
 
diff --git a/argument.hpp b/argument.hpp
index c1a80d2..790041b 100644
--- a/argument.hpp
+++ b/argument.hpp
@@ -44,7 +44,11 @@
     std::map<const std::string, std::string> arguments;
 
     /** @brief Array of struct options as needed by getopt_long */
-    static const option options[];
+    static inline const option options[] = {
+        {"path", required_argument, nullptr, 'p'},
+        {"help", no_argument, nullptr, 'h'},
+        {nullptr, 0, nullptr, 0},
+    };
 
     /** @brief optstring as needed by getopt_long */
     static inline const char* optionstr = "p:?h";