diff --git a/plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts b/plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts
index 43b1466..f4805db 100644
--- a/plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts
+++ b/plat/arm/board/fvp/fdts/fvp_spmc_manifest.dts
@@ -33,6 +33,8 @@
 			is_ffa_partition;
 			debug_name = "cactus-primary";
 			load_address = <0x7000000>;
+			vcpu_count = <8>;
+			mem_size = <1048576>;
 		};
 		vm2 {
 			is_ffa_partition;
diff --git a/plat/arm/board/fvp/fdts/fvp_spmc_optee_sp_manifest.dts b/plat/arm/board/fvp/fdts/fvp_spmc_optee_sp_manifest.dts
index 117909d..57d6792 100644
--- a/plat/arm/board/fvp/fdts/fvp_spmc_optee_sp_manifest.dts
+++ b/plat/arm/board/fvp/fdts/fvp_spmc_optee_sp_manifest.dts
@@ -34,6 +34,8 @@
 			debug_name = "op-tee";
 			load_address = <0x6280000>;
 			smc_whitelist = <0xbe000000>;
+			vcpu_count = <8>;
+			mem_size = <1048576>;
 		};
 	};