diff --git a/src/system/libroot/posix/glibc/stdio-common/printf_size.c b/src/system/libroot/posix/glibc/stdio-common/printf_size.c
index 202e51a7a5..95b7aa3724 100644
--- a/src/system/libroot/posix/glibc/stdio-common/printf_size.c
+++ b/src/system/libroot/posix/glibc/stdio-common/printf_size.c
@@ -19,6 +19,8 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
+#include <libioP.h>
+
 #include <stdio_private.h>
 #include <ctype.h>
 #include <ieee754.h>