diff --git a/src/compiler/shader_enums.c b/src/compiler/shader_enums.c
index 942d152b129..003ad3b8ab6 100644
--- a/src/compiler/shader_enums.c
+++ b/src/compiler/shader_enums.c
@@ -201,6 +201,7 @@ gl_system_value_name(gl_system_value sysval)
    static const char *names[] = {
      ENUM(SYSTEM_VALUE_VERTEX_ID),
      ENUM(SYSTEM_VALUE_INSTANCE_ID),
+     ENUM(SYSTEM_VALUE_INSTANCE_INDEX),
      ENUM(SYSTEM_VALUE_VERTEX_ID_ZERO_BASE),
      ENUM(SYSTEM_VALUE_BASE_VERTEX),
      ENUM(SYSTEM_VALUE_INVOCATION_ID),
diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index 07ae9ee2de7..0c43d5a92cb 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -378,6 +378,13 @@ typedef enum
     */
    SYSTEM_VALUE_INSTANCE_ID,
 
+   /**
+    * Vulkan InstanceIndex.
+    *
+    * InstanceIndex = gl_InstanceID + gl_BaseInstance
+    */
+   SYSTEM_VALUE_INSTANCE_INDEX,
+
    /**
     * DirectX-style vertex ID.
     *