diff --git a/include/seqan3/std/charconv b/include/seqan3/std/charconv
index 205a0d43cd..cac9de245b 100644
--- a/include/seqan3/std/charconv
+++ b/include/seqan3/std/charconv
@@ -11,7 +11,9 @@
  * \author Svenja Mehringer <svenja.mehringer AT fu-berlin.de>
  */
 
-#pragma once
+// File might be included from multiple libraries.
+#ifndef SEQAN_STD_CHARCONV_SHIM
+#define SEQAN_STD_CHARCONV_SHIM
 
 #include <charconv>
 #include <utility> // __cpp_lib_to_chars may be defined here as currently documented.
@@ -270,3 +272,5 @@ using ::seqan3::contrib::charconv_float::from_chars; // import our shim-float ve
 } // namespace std
 
 #endif // __cpp_lib_to_chars < 201611
+
+#endif // SEQAN_STD_CHARCONV_SHIM
diff --git a/include/seqan3/std/new b/include/seqan3/std/new
index e4d5ac56b3..c0893c4636 100644
--- a/include/seqan3/std/new
+++ b/include/seqan3/std/new
@@ -11,7 +11,9 @@
  * \author Rene Rahn <rene.rahn AT fu-berlin.de>
  */
 
-#pragma once
+// File might be included from multiple libraries.
+#ifndef SEQAN_STD_NEW_SHIM
+#define SEQAN_STD_NEW_SHIM
 
 #include <new>
 
@@ -40,3 +42,5 @@ inline constexpr std::size_t hardware_constructive_interference_size = 64;
 } // namespace std
 
 #endif // __cpp_lib_hardware_interference_size
+
+#endif // SEQAN_STD_NEW_SHIM
diff --git a/include/seqan3/std/ranges b/include/seqan3/std/ranges
index 5594bda397..239e5c9fd3 100644
--- a/include/seqan3/std/ranges
+++ b/include/seqan3/std/ranges
@@ -11,7 +11,9 @@
  * \author Hannes Hauswedell <hannes.hauswedell AT fu-berlin.de>
  */
 
-#pragma once
+// File might be included from multiple libraries.
+#ifndef SEQAN_STD_RANGES_SHIM
+#define SEQAN_STD_RANGES_SHIM
 
 #include <iterator>
 #include <ranges>
@@ -112,3 +114,5 @@ template<class T>
 //!\endcond
 inline constexpr bool enable_borrowed_range<T> = true;
 } // namespace std::ranges
+
+#endif // SEQAN_STD_RANGES_SHIM