diff --git a/include/spdlog/details/os-inl.h b/include/spdlog/details/os-inl.h
index 7f22335fb..2ac8cc3f5 100644
--- a/include/spdlog/details/os-inl.h
+++ b/include/spdlog/details/os-inl.h
@@ -286,7 +286,7 @@ SPDLOG_INLINE int utc_minutes_offset(const std::tm &tm)
     return offset;
 #else
 
-#    if defined(sun) || defined(__sun) || defined(_AIX) || (!defined(_BSD_SOURCE) && !defined(_GNU_SOURCE))
+#    if defined(sun) || defined(__sun) || defined(_AIX) || (defined(__NEWLIB__) && !defined(__TM_GMTOFF)) || (!defined(_BSD_SOURCE) && !defined(_GNU_SOURCE))
     // 'tm_gmtoff' field is BSD extension and it's missing on SunOS/Solaris
     struct helper
     {