diff --git a/src/faketime_common.h b/src/faketime_common.h
index 411ac99..9fda6a7 100644
--- a/src/faketime_common.h
+++ b/src/faketime_common.h
@@ -32,6 +32,10 @@ struct system_time_s
   struct timespec mon;
   /* System time according to CLOCK_MONOTONIC_RAW */
   struct timespec mon_raw;
+#ifdef CLOCK_BOOTTIME
+  /* System time according to CLOCK_BOOTTIME */
+  struct timespec boot;
+#endif
 };
 
 /* Data shared among faketime-spawned processes */
diff --git a/src/libfaketime.c b/src/libfaketime.c
index 89a7de1..c586da1 100644
--- a/src/libfaketime.c
+++ b/src/libfaketime.c
@@ -228,7 +228,11 @@ static int cache_duration = 10;     /* cache fake time input for 10 seconds */
  * Static timespec to store our startup time, followed by a load-time library
  * initialization declaration.
  */
+#ifndef CLOCK_BOOTTIME
 static struct system_time_s ftpl_starttime = {{0, -1}, {0, -1}, {0, -1}};
+#else
+static struct system_time_s ftpl_starttime = {{0, -1}, {0, -1}, {0, -1}, {0, -1}};
+#endif
 
 static char user_faked_time_fmt[BUFSIZ] = {0};
 
@@ -342,7 +346,12 @@ static void system_time_from_system (struct system_time_s * systime)
    ;
   DONT_FAKE_TIME((*real_clock_gettime)(CLOCK_MONOTONIC, &systime->mon))
    ;
-  DONT_FAKE_TIME((*real_clock_gettime)(CLOCK_MONOTONIC_RAW, &systime->mon_raw));
+  DONT_FAKE_TIME((*real_clock_gettime)(CLOCK_MONOTONIC_RAW, &systime->mon_raw))
+   ;
+#ifdef CLOCK_BOOTTIME
+  DONT_FAKE_TIME((*real_clock_gettime)(CLOCK_BOOTTIME, &systime->boot))
+   ;
+#endif
 #endif
 }
 
@@ -2001,6 +2010,11 @@ int fake_clock_gettime(clockid_t clk_id, struct timespec *tp)
       case CLOCK_MONOTONIC_RAW:
         timespecsub(tp, &ftpl_starttime.mon_raw, &tmp_ts);
         break;
+#ifdef CLOCK_BOOTTIME
+      case CLOCK_BOOTTIME:
+        timespecsub(tp, &ftpl_starttime.boot, &tmp_ts);
+        break;
+#endif
       default:
         printf("Invalid clock_id for clock_gettime: %d", clk_id);
         exit(EXIT_FAILURE);
@@ -2147,6 +2161,11 @@ int fake_clock_gettime(clockid_t clk_id, struct timespec *tp)
           case CLOCK_MONOTONIC_RAW:
             timespecsub(tp, &ftpl_starttime.mon_raw, &tdiff);
             break;
+#ifdef CLOCK_BOOTTIME
+          case CLOCK_BOOTTIME:
+            timespecsub(tp, &ftpl_starttime.boot, &tdiff);
+            break;
+#endif
           default:
             printf("Invalid clock_id for clock_gettime: %d", clk_id);
             exit(EXIT_FAILURE);