diff --git a/include/wx/math.h b/include/wx/math.h
index 5240f1759e..c1dda9e6d2 100644
--- a/include/wx/math.h
+++ b/include/wx/math.h
@@ -62,7 +62,12 @@
         add more compilers with C99 support here: using C99 isfinite() is
         preferable to using BSD-ish finite()
      */
-    #define wxFinite(x) isfinite(x)
+    #if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
+        // these <cmath> headers #undef isfinite
+        #define wxFinite(x) std::isfinite(x)
+    #else
+        #define wxFinite(x) isfinite(x)
+    #endif
 #elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
       defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )