diff --git a/tests/t406-qfunction.h b/tests/t406-qfunction.h
index 1bad1b96b1..cad64ec563 100644
--- a/tests/t406-qfunction.h
+++ b/tests/t406-qfunction.h
@@ -6,12 +6,6 @@
 // This file is part of CEED:  http://github.com/ceed
 
 // Note: intentionally testing strange spacing in '#include's
-#ifdef __cplusplus
-#include <cmath>
-#else
-#include  <math.h>
-#endif
-
 #include <ceed.h>
 #include "./t406-qfunction-scales.h"
 # include   "t406-qfunction-helper.h"