diff --git a/src/platform/platform.hpp b/src/platform/platform.hpp
index 89206e82..f89962ce 100644
--- a/src/platform/platform.hpp
+++ b/src/platform/platform.hpp
@@ -8,7 +8,7 @@
 #if defined(_WIN32)
  #undef IS_WINDOWS
  #define IS_WINDOWS 1
-#elif defined(__linux)
+#elif defined(__linux) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
  #undef IS_LINUX
  #define IS_LINUX 1
 #elif defined(__APPLE__)
diff --git a/src/utils/utils.cpp b/src/utils/utils.cpp
index fb806937..480e5ea6 100644
--- a/src/utils/utils.cpp
+++ b/src/utils/utils.cpp
@@ -23,13 +23,11 @@ namespace detail {
         #endif
     }
 
+#if IS_WINDOWS
     int fileno(std::FILE* stream) {
-        #if IS_WINDOWS
          return _fileno(stream);
-        #else
-         return ::fileno(stream);
-        #endif
     }
+#endif
 
     void enable_virtual_terminal_processing_if_needed() noexcept {
         // enable colors / ansi processing if necessary
diff --git a/src/utils/utils.hpp b/src/utils/utils.hpp
index d255940d..e9f32b99 100644
--- a/src/utils/utils.hpp
+++ b/src/utils/utils.hpp
@@ -20,7 +20,9 @@
 CPPTRACE_BEGIN_NAMESPACE
 namespace detail {
     bool isatty(int fd);
+#if IS_WINDOWS
     int fileno(std::FILE* stream);
+#endif
 
     void enable_virtual_terminal_processing_if_needed() noexcept;