diff --git a/Kernel/UnixTypes.h b/Kernel/UnixTypes.h
index 66c07c6496..3b50ef1957 100644
--- a/Kernel/UnixTypes.h
+++ b/Kernel/UnixTypes.h
@@ -466,6 +466,7 @@ typedef enum {
 
 typedef int clockid_t;
 
+#define CLOCK_REALTIME 0
 #define CLOCK_MONOTONIC 1
 #define TIMER_ABSTIME 99
 
diff --git a/Libraries/LibC/time.h b/Libraries/LibC/time.h
index 84a9898754..f94fed9c99 100644
--- a/Libraries/LibC/time.h
+++ b/Libraries/LibC/time.h
@@ -69,6 +69,7 @@ struct timespec {
 
 typedef int clockid_t;
 
+#define CLOCK_REALTIME 0
 #define CLOCK_MONOTONIC 1
 #define TIMER_ABSTIME 99