diff --git a/configure.ac b/configure.ac
index e7d76f8f3..48417fb1d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1067,6 +1067,7 @@ RB_CHK_SYSHEADER(functional, [FUNCTIONAL])
 RB_CHK_SYSHEADER(algorithm, [ALGORITHM])
 RB_CHK_SYSHEADER(numeric, [NUMERIC])
 RB_CHK_SYSHEADER(cmath, [CMATH])
+RB_CHK_SYSHEADER(cfloat, [CFLOAT])
 RB_CHK_SYSHEADER(cfenv, [CFENV])
 RB_CHK_SYSHEADER(memory, [MEMORY])
 RB_CHK_SYSHEADER(exception, [EXCEPTION])
diff --git a/include/ircd/stdinc.h b/include/ircd/stdinc.h
index 69365987e..14f5e9a15 100644
--- a/include/ircd/stdinc.h
+++ b/include/ircd/stdinc.h
@@ -89,6 +89,7 @@ extern "C"
 #include <RB_INC_STRING_VIEW
 
 // Numerics
+#include <RB_INC_CFLOAT
 #include <RB_INC_CFENV
 #include <RB_INC_CMATH
 #include <RB_INC_NUMERIC