diff --git a/Tests/Conformance/C26.0.1.CC b/Tests/Conformance/C26.0.1.CC
index bb9d53f..77017fa 100644
--- a/Tests/Conformance/C26.0.1.CC
+++ b/Tests/Conformance/C26.0.1.CC
@@ -10,6 +10,7 @@
 #include <dialog.h>
 #include <errno.h>
 #include <event.h>
+#include <fenv.h>
 #include <font.h>
 #include <gsos.h>
 #include <intmath.h>