diff --git a/core/sys/windows/advapi32.odin b/core/sys/windows/advapi32.odin
index 1eb6d7049..ab2c6737f 100644
--- a/core/sys/windows/advapi32.odin
+++ b/core/sys/windows/advapi32.odin
@@ -110,4 +110,13 @@ foreign advapi32 {
 		pvData: PVOID,
 		pcbData: LPDWORD,
 	) -> LSTATUS ---
+
+	RegSetValueExW :: proc(
+		hKey: HKEY,
+		lpValueName: LPCWSTR,
+		Reserved: DWORD,
+		dwType: DWORD,
+		lpData: ^BYTE,
+		cbData: DWORD,
+	) -> LSTATUS ---
 }