diff --git a/include/boost/math/tools/config.hpp b/include/boost/math/tools/config.hpp
index 93d6af8641..12f3411c2f 100644
--- a/include/boost/math/tools/config.hpp
+++ b/include/boost/math/tools/config.hpp
@@ -220,12 +220,16 @@
 
 #include <boost/math/tools/user.hpp>
 
-#if (defined(__NetBSD__) || defined(__EMSCRIPTEN__)\
+#if (defined(__NetBSD__)\
    || (defined(__hppa) && !defined(__OpenBSD__)) || (defined(__NO_LONG_DOUBLE_MATH) && (DBL_MANT_DIG != LDBL_MANT_DIG))) \
    && !defined(BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS)
 //#  define BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
 #endif
 
+#if defined(__EMSCRIPTEN__) && !defined(BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS)
+#  define BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS
+#endif
+
 #ifdef __IBMCPP__
 //
 // For reasons I don't understand, the tests with IMB's compiler all