diff --git a/src-input/duk_api_stack.c b/src-input/duk_api_stack.c
index dfe7ceb5e0..dfc277c1b8 100644
--- a/src-input/duk_api_stack.c
+++ b/src-input/duk_api_stack.c
@@ -5224,7 +5224,7 @@ DUK_INTERNAL void *duk_push_fixed_buffer_zero(duk_hthread *thr, duk_size_t len)
 }
 
 #if defined(DUK_USE_ES6_PROXY)
-DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr) {
+DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr, duk_uint_t proxy_flags) {
 	duk_hobject *h_target;
 	duk_hobject *h_handler;
 	duk_hproxy *h_proxy;
@@ -5232,6 +5232,7 @@ DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr) {
 	duk_uint_t flags;
 
 	DUK_ASSERT_API_ENTRY(thr);
+	DUK_UNREF(proxy_flags);
 
 	/* DUK__CHECK_SPACE() unnecessary because the Proxy is written to
 	 * value stack in-place.
@@ -5316,8 +5317,9 @@ DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr) {
 	DUK_ERROR_TYPE_INVALID_ARGS(thr);
 }
 #else  /* DUK_USE_ES6_PROXY */
-DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr) {
+DUK_EXTERNAL duk_idx_t duk_push_proxy(duk_hthread *thr, duk_uint_t proxy_flags) {
 	DUK_ASSERT_API_ENTRY(thr);
+	DUK_UNREF(proxy_flags);
 	DUK_ERROR_UNSUPPORTED(thr);
 }
 #endif  /* DUK_USE_ES6_PROXY */
diff --git a/src-input/duk_bi_proxy.c b/src-input/duk_bi_proxy.c
index 4c7d93100d..b80bb4b943 100644
--- a/src-input/duk_bi_proxy.c
+++ b/src-input/duk_bi_proxy.c
@@ -89,7 +89,7 @@ DUK_INTERNAL duk_ret_t duk_bi_proxy_constructor(duk_hthread *thr) {
 	DUK_ASSERT_TOP(thr, 2);  /* [ target handler ] */
 
 	duk_require_constructor_call(thr);
-	duk_push_proxy(thr);  /* [ target handler ] -> [ proxy ] */
+	duk_push_proxy(thr, 0 /*flags*/);  /* [ target handler ] -> [ proxy ] */
 	return 1;  /* replacement */
 }
 #endif  /* DUK_USE_ES6_PROXY */
diff --git a/src-input/duktape.h.in b/src-input/duktape.h.in
index 63e05153d9..dbfeff239e 100644
--- a/src-input/duktape.h.in
+++ b/src-input/duktape.h.in
@@ -536,7 +536,7 @@ DUK_EXTERNAL_DECL duk_idx_t duk_push_array(duk_context *ctx);
 DUK_EXTERNAL_DECL duk_idx_t duk_push_c_function(duk_context *ctx, duk_c_function func, duk_idx_t nargs);
 DUK_EXTERNAL_DECL duk_idx_t duk_push_c_lightfunc(duk_context *ctx, duk_c_function func, duk_idx_t nargs, duk_idx_t length, duk_int_t magic);
 DUK_EXTERNAL_DECL duk_idx_t duk_push_thread_raw(duk_context *ctx, duk_uint_t flags);
-DUK_EXTERNAL_DECL duk_idx_t duk_push_proxy(duk_context *ctx);
+DUK_EXTERNAL_DECL duk_idx_t duk_push_proxy(duk_context *ctx, duk_uint_t proxy_flags);
 
 #define duk_push_thread(ctx) \
 	duk_push_thread_raw((ctx), 0 /*flags*/)