diff --git a/OpenCL/inc_rp_optimized.cl b/OpenCL/inc_rp_optimized.cl
index 6497aa5ad..1db011169 100644
--- a/OpenCL/inc_rp_optimized.cl
+++ b/OpenCL/inc_rp_optimized.cl
@@ -2547,7 +2547,7 @@ static u32 apply_rules (__constant const u32 *cmds, u32 buf0[4], u32 buf1[4], co
   return out_len;
 }
 
-static u32x apply_rules_vect (const u32 pw_buf0[4], const u32 pw_buf1[4], const u32 pw_len, __global const kernel_rule_t *rules_buf, const u32 il_pos, u32x buf0[4], u32x buf1[4])
+static u32x apply_rules_vect (const u32 pw_buf0[4], const u32 pw_buf1[4], const u32 pw_len, __constant const kernel_rule_t *rules_buf, const u32 il_pos, u32x buf0[4], u32x buf1[4])
 {
   #if VECT_SIZE == 1