diff --git a/cfg/std.cfg b/cfg/std.cfg
index 4e0ac854e..496397ea7 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -68,6 +68,12 @@
   <define name="_IOFBF" value="0"/>
   <define name="_IOLBF" value="1"/>
   <define name="_IONBF" value="2"/>
+  <!-- https://en.cppreference.com/w/cpp/numeric/math/FP_categories -->
+  <define name="FP_NORMAL" value="1"/>
+  <define name="FP_SUBNORMAL" value="2"/>
+  <define name="FP_ZERO" value="3"/>
+  <define name="FP_INFINITE" value="4"/>
+  <define name="FP_NAN" value="5"/>
   <!-- errno_t is a typedef for int -->
   <define name="errno_t" value="int"/>
   <!-- void abort(void); -->