diff --git a/repos/base-linux/src/lib/syscall/linux_syscalls.h b/repos/base-linux/src/lib/syscall/linux_syscalls.h
index 1b9a091a2e..ad1745021f 100644
--- a/repos/base-linux/src/lib/syscall/linux_syscalls.h
+++ b/repos/base-linux/src/lib/syscall/linux_syscalls.h
@@ -44,6 +44,7 @@
 #define size_t __SIZE_TYPE__
 
 /* Linux includes */
+#include <sys/cdefs.h>   /* include first to avoid double definition of '__always_inline' */
 #include <linux/futex.h>
 #include <unistd.h>
 #include <signal.h>