diff --git a/sdk/lib/3rdparty/libxml2/trionan.c b/sdk/lib/3rdparty/libxml2/trionan.c
index 6fbabb5dbd8..71f1b1b9b37 100644
--- a/sdk/lib/3rdparty/libxml2/trionan.c
+++ b/sdk/lib/3rdparty/libxml2/trionan.c
@@ -327,7 +327,7 @@ trio_nan(TRIO_NOARGS)
 
   if (result == 0.0) {
 
-#if defined(TRIO_COMPILER_SUPPORTS_C99)
+#if defined(TRIO_COMPILER_SUPPORTS_C99) && !defined(__clang__)
     result = nan("");
 
 #elif defined(NAN) && defined(__STDC_IEC_559__)