diff --git a/common/phones/nk6510.c b/common/phones/nk6510.c
index e3fe988..2f02f0c 100644
--- a/common/phones/nk6510.c
+++ b/common/phones/nk6510.c
@@ -6212,6 +6212,9 @@ static int get_memory_type(gn_memory_type memory_type)
 	case GN_MT_OU:
 		result = NK6510_MEMORY_OU;
 		break;
+	case GN_MT_OUS:
+		result = NK6510_MEMORY_OUS;
+		break;
 	case GN_MT_AR:
 		result = NK6510_MEMORY_AR;
 		break;
@@ -6296,6 +6299,9 @@ static gn_memory_type get_gn_memory_type(int memory_type)
 	case NK6510_MEMORY_OU:
 		result = GN_MT_OU;
 		break;
+	case NK6510_MEMORY_OUS:
+		result = GN_MT_OUS;
+		break;
 	case NK6510_MEMORY_AR:
 		result = GN_MT_AR;
 		break;
diff --git a/include/phones/nk6510.h b/include/phones/nk6510.h
index 9722258..4bd618b 100644
--- a/include/phones/nk6510.h
+++ b/include/phones/nk6510.h
@@ -174,8 +174,9 @@ typedef enum {
 #define NK6510_MEMORY_F18		0x23
 #define NK6510_MEMORY_F19		0x24
 #define NK6510_MEMORY_F20		0x25	/* MY FOLDERS 20 */
+#define NK6510_MEMORY_OUS		0xff
 /* This is used when the memory type is unknown. */
-#define NK6510_MEMORY_XX		0xff
+#define NK6510_MEMORY_XX		0xffff
 
 /* Entry Types for the enhanced phonebook */
 #define NK6510_ENTRYTYPE_POINTER	0x1a	/* Pointer to other memory */