diff --git a/src/main.cpp b/src/main.cpp
index 35f93a9..4e6f0f5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -49,14 +49,14 @@ int main(int argc, char* argv[]) {
                     resultingPair.first = compile(fileName);
                 } catch (const Yerbacon::Exception& error) {
                     unsigned long lastSlash = 0;
-                    unsigned long position1 = fileName.find_last_of('/');
+                    const unsigned long position1 = fileName.find_last_of('/');
                     const bool isNPOS = cmp_equal(position1, string_view::npos)
                     if constexpr(filesystem::path::preferred_separator == '/') {
                         if (not isNPOS) {
                             lastSlash = position1;
                         }
                     } else {
-                        unsigned long position2 = fileName.find_last_of(filesystem::path::preferred_separator);
+                        const unsigned long position2 = fileName.find_last_of(filesystem::path::preferred_separator);
                         if (cmp_not_equal(position2, string_view::npos)) {
                             lastSlash = (isNPOS) ? position2 : max(position1, position2);
                         }