diff --git a/lib/libc/common/source/time/gmtime_r.c b/lib/libc/common/source/time/gmtime_r.c
index ff23fc032ea..96afa6bc742 100644
--- a/lib/libc/common/source/time/gmtime_r.c
+++ b/lib/libc/common/source/time/gmtime_r.c
@@ -10,6 +10,7 @@
  * http://howardhinnant.github.io/date_algorithms.html#civil_from_days
  */
 
+#include <zephyr/toolchain.h>
 #include <time.h>
 
 /* A signed type with the representation of time_t without its