diff --git a/headers/private/graphics/nvidia/nv_macros.h b/headers/private/graphics/nvidia/nv_macros.h
index 48a90a9b34..9b4d97c58e 100644
--- a/headers/private/graphics/nvidia/nv_macros.h
+++ b/headers/private/graphics/nvidia/nv_macros.h
@@ -590,6 +590,7 @@
 #define NVDAC_FP_DEBUG3		0x0068088c
 /* secondary head */
 #define NVDAC2_CURPOS		0x00682300
+#define NVDAC2_NV10_CURSYNC	0x00682404
 #define NVDAC2_PIXPLLC		0x00680520
 #define NVDAC2_OUTPUT		0x0068252c
 #define NVDAC2_PIXPLLC2		0x0068057c