diff --git a/lib/libimhex/include/hex/helpers/utils.hpp b/lib/libimhex/include/hex/helpers/utils.hpp
index e3d1034f6..f56662545 100644
--- a/lib/libimhex/include/hex/helpers/utils.hpp
+++ b/lib/libimhex/include/hex/helpers/utils.hpp
@@ -84,6 +84,13 @@ namespace hex {
         return result;
     }
 
+    constexpr inline size_t strnlen(const char *s, size_t n) {
+        size_t i = 0;
+        while (i < n && s[i] != '\x00') i++;
+
+        return i;
+    }
+
     template<class... Ts>
     struct overloaded : Ts... { using Ts::operator()...; };
     template<class... Ts>
diff --git a/lib/libimhex/source/helpers/file.cpp b/lib/libimhex/source/helpers/file.cpp
index 05ddd39c5..e24765601 100644
--- a/lib/libimhex/source/helpers/file.cpp
+++ b/lib/libimhex/source/helpers/file.cpp
@@ -1,7 +1,8 @@
 #include <hex/helpers/file.hpp>
 
+#include <hex/helpers/utils.hpp>
+
 #include <unistd.h>
-#include <cstring>
 
 namespace hex::fs {
 
@@ -90,7 +91,7 @@ namespace hex::fs {
             return "";
 
         auto cString = reinterpret_cast<const char *>(bytes.data());
-        return { cString, std::strnlen(cString, bytes.size()) };
+        return { cString, hex::strnlen(cString, bytes.size()) };
     }
 
     std::u8string File::readU8String(size_t numBytes) {
@@ -104,7 +105,7 @@ namespace hex::fs {
             return u8"";
 
         auto cString = reinterpret_cast<const char8_t *>(bytes.data());
-        return { cString, std::min(bytes.size(), std::strlen(reinterpret_cast<const char*>(bytes.data()))) };
+        return { cString, hex::strnlen(reinterpret_cast<const char*>(bytes.data()), bytes.size())) };
     }
 
     void File::write(const u8 *buffer, size_t size) {