diff --git a/include/internal/common.hpp b/include/internal/common.hpp
index 82e1404..c95cb98 100644
--- a/include/internal/common.hpp
+++ b/include/internal/common.hpp
@@ -125,7 +125,7 @@
 #endif

 // Include string_view BEFORE csv namespace to avoid namespace pollution issues
-#ifdef CSV_HAS_CXX17
+#if 1
 #include <string_view>
 #else
 #include "../external/string_view.hpp"
diff --git a/include/internal/csv_row.hpp b/include/internal/csv_row.hpp
index 7651f86..000f645 100644
--- a/include/internal/csv_row.hpp
+++ b/include/internal/csv_row.hpp
@@ -33,7 +33,7 @@
 #include <ranges>
 #endif
 #include "data_type.hpp"
-#include "../external/classify_scalar.hpp"
+#include "classify_scalar.hpp"
 #include "json_converter.hpp"
 #include "raw_csv_data.hpp"

diff --git a/include/internal/data_type.hpp b/include/internal/data_type.hpp
index b3f85d4..5a8be67 100644
--- a/include/internal/data_type.hpp
+++ b/include/internal/data_type.hpp
@@ -7,7 +7,7 @@
 #include <cstdint>

 #include "common.hpp"
-#include "../external/classify_scalar.hpp"
+#include "classify_scalar.hpp"

 namespace csv {
     /** Enumerates the different CSV field types recognized by this library. */
diff --git a/include/internal/parser/driver.hpp b/include/internal/parser/driver.hpp
index 357a785..64b3c12 100644
--- a/include/internal/parser/driver.hpp
+++ b/include/internal/parser/driver.hpp
@@ -16,7 +16,7 @@
 #include <vector>

 #if !defined(__EMSCRIPTEN__)
-#include "../../external/mio.hpp"
+#include "mio/mmap.hpp"
 #endif
 #include "../basic_csv_parser_simd.hpp"
 #include "../col_names.hpp"