diff --git a/src/kernel/libroot/posix/math/cbrt.c b/src/kernel/libroot/posix/math/cbrt.c
index 13ee6d74f4..52ce7d02f3 100644
--- a/src/kernel/libroot/posix/math/cbrt.c
+++ b/src/kernel/libroot/posix/math/cbrt.c
@@ -31,7 +31,6 @@
  * SUCH DAMAGE.
  */
 
-#include <cdefs.h>
 #include <math.h>
 
 /* kahan's cube root (53 bits IEEE double precision)