diff --git a/headers/os/kernel/OS.h b/headers/os/kernel/OS.h
index f69eb7c64d..1bcf74b0ae 100644
--- a/headers/os/kernel/OS.h
+++ b/headers/os/kernel/OS.h
@@ -561,6 +561,8 @@ typedef enum cpu_types {
 	/* Transmeta */
 	B_CPU_TRANSMETA_x86					= 0x1600,
 	B_CPU_TRANSMETA_CRUSOE				= 0x1654,
+	B_CPU_TRANSMETA_EFFICEON			= 0x16f2,
+	B_CPU_TRANSMETA_EFFICEON_2			= 0x16f3,
 
 	/* Rise */
 	B_CPU_RISE_x86						= 0x1400,
diff --git a/headers/private/shared/cpu_type.h b/headers/private/shared/cpu_type.h
index f49787d802..c34540051b 100644
--- a/headers/private/shared/cpu_type.h
+++ b/headers/private/shared/cpu_type.h
@@ -166,6 +166,9 @@ get_cpu_model_string(system_info *info)
 		/* Transmeta */
 		case B_CPU_TRANSMETA_CRUSOE:
 			return "Crusoe";
+		case B_CPU_TRANSMETA_EFFICEON:
+		case B_CPU_TRANSMETA_EFFICEON_2:
+			return "Efficeon";
 
 		/* IDT/VIA */
 		case B_CPU_IDT_WINCHIP_C6: