diff --git a/.clang-tidy b/.clang-tidy
index 419f5ee..c1dd300 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -3,7 +3,6 @@ Checks:
   readability-*,
   -readability-else-after-return,
   -readability-function-cognitive-complexity,
-  -readability-static-accessed-through-instance,
 
 CheckOptions:
   - { key: readability-identifier-naming.ClassCase, value: CamelCase }
diff --git a/include/argparse/argparse.hpp b/include/argparse/argparse.hpp
index ddade05..112dbb0 100644
--- a/include/argparse/argparse.hpp
+++ b/include/argparse/argparse.hpp
@@ -303,7 +303,7 @@ template <class T> struct parse_number<T, chars_format::scientific> {
       throw std::invalid_argument{
           "chars_format::scientific does not parse hexfloat"};
     }
-    if (s.find_first_of("eE") == s.npos) {
+    if (s.find_first_of("eE") == std::string::npos) {
       throw std::invalid_argument{
           "chars_format::scientific requires exponent part"};
     }
@@ -318,7 +318,7 @@ template <class T> struct parse_number<T, chars_format::fixed> {
       throw std::invalid_argument{
           "chars_format::fixed does not parse hexfloat"};
     }
-    if (s.find_first_of("eE") != s.npos) {
+    if (s.find_first_of("eE") != std::string::npos) {
       throw std::invalid_argument{
           "chars_format::fixed does not parse exponent part"};
     }