diff --git a/spm/cactus/cactus_main.c b/spm/cactus/cactus_main.c
index bfbfa48..a062ef0 100644
--- a/spm/cactus/cactus_main.c
+++ b/spm/cactus/cactus_main.c
@@ -12,6 +12,7 @@
 #include <pl011.h>
 #include <plat_arm.h>
 #include <platform_def.h>
+#include <sp_helpers.h>
 #include <sprt_client.h>
 #include <sprt_svc.h>
 #include <std_svc.h>
@@ -70,6 +71,11 @@
 			ret0 = SPRT_SUCCESS;
 			break;
 
+		case CACTUS_SLEEP_MS:
+			sp_sleep(message->args[2]);
+			ret0 = SPRT_SUCCESS;
+			break;
+
 		default:
 			NOTICE("Cactus: Unhandled Service ID 0x%x\n",
 			       (unsigned int)message->args[1]);