diff --git a/include/wx/math.h b/include/wx/math.h
index 2787163f78..89a1b94473 100644
--- a/include/wx/math.h
+++ b/include/wx/math.h
@@ -60,7 +60,7 @@
 #elif defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
     #include <float.h>
     #define wxFinite(x) _finite(x)
-#elif defined(__MINGW64__) || defined(__clang__)
+#elif defined(__MINGW64_TOOLCHAIN__) || defined(__clang__)
     /*
         add more compilers with C99 support here: using C99 isfinite() is
         preferable to using BSD-ish finite()