diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 47f413d..a8b56ff 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -72,10 +72,12 @@
 #define isnan(x) (x != x)
 #endif
 
+#if !defined(__APPLE__)
 #if !defined(isfinite)
 #define isfinite finite
 #endif
 #endif
+#endif
 
 #if defined(_MSC_VER) && _MSC_VER >= 1400 // VC++ 8.0
 // Disable warning about strdup being deprecated.