out

diff --git a/src/mono/wasm/runtime/binding_support.js b/src/mono/wasm/runtime/binding_support.js
index 7c088060e23..6f9133cadc8 100644
--- a/src/mono/wasm/runtime/binding_support.js
+++ b/src/mono/wasm/runtime/binding_support.js
@@ -280,11 +280,11 @@ var BindingSupportLib = {
 				return interned_instance;
 
 			var result = MONO.string_decoder.copy (mono_obj);
-			if (interned) {
+			if (result.interned || interned) {
 				// This string is interned on the managed side but we didn't have it in our cache.
-				this._store_string_in_intern_table (result, mono_obj, false);
+				this._store_string_in_intern_table (result.value, mono_obj, false);
 			}
-			return result;
+			return result.value;
 		},
 
 		is_nested_array: function (ele) {
diff --git a/src/mono/wasm/runtime/dotnet_support.js b/src/mono/wasm/runtime/dotnet_support.js
index c780db55dbe..794900640a1 100644
--- a/src/mono/wasm/runtime/dotnet_support.js
+++ b/src/mono/wasm/runtime/dotnet_support.js
@@ -4,7 +4,7 @@
 var DotNetSupportLib = {
 	$DOTNET: {
 		conv_string: function (mono_obj) {
-			return MONO.string_decoder.copy (mono_obj);
+			return MONO.string_decoder.copy (mono_obj).value;
 		}
 	},
 	mono_wasm_invoke_js_blazor: function(exceptionMessage, callInfo, arg0, arg1, arg2)	{
diff --git a/src/mono/wasm/runtime/driver.c b/src/mono/wasm/runtime/driver.c
index d1680e62235..5ff922dfaaa 100644
--- a/src/mono/wasm/runtime/driver.c
+++ b/src/mono/wasm/runtime/driver.c
@@ -694,11 +694,11 @@ mono_wasm_string_get_utf8 (MonoString *str)
 	return mono_string_to_utf8 (str); //XXX JS is responsible for freeing this
 }
 
-EMSCRIPTEN_KEEPALIVE void
+EMSCRIPTEN_KEEPALIVE int
 mono_wasm_string_convert (MonoString *str)
 {
 	if (str == NULL)
-		return;
+		return 0;
 
 	mono_unichar2 *native_val = mono_string_chars (str);
 	int native_len = mono_string_length (str) * 2;
@@ -706,6 +706,8 @@ mono_wasm_string_convert (MonoString *str)
 	EM_ASM ({
 		MONO.string_decoder.decode($0, $0 + $1, true);
 	}, (int)native_val, native_len);
+
+	return mono_string_is_interned (str);
 }
 
 EMSCRIPTEN_KEEPALIVE MonoString *
diff --git a/src/mono/wasm/runtime/library_mono.js b/src/mono/wasm/runtime/library_mono.js
index fc212721460..a2a4df03c22 100644
--- a/src/mono/wasm/runtime/library_mono.js
+++ b/src/mono/wasm/runtime/library_mono.js
@@ -488,15 +488,16 @@ var MonoSupportLib = {
 		string_decoder: {
 			copy: function (mono_string) {
 				if (mono_string == 0)
-					return null;
+					return { value: null, interned: false };
 
 				if (!this.mono_wasm_string_convert)
-					this.mono_wasm_string_convert = Module.cwrap ("mono_wasm_string_convert", null, ['number']);
+					this.mono_wasm_string_convert = Module.cwrap ("mono_wasm_string_convert", 'number', ['number']);
+
+				var interned = this.mono_wasm_string_convert (mono_string);
 
-				this.mono_wasm_string_convert (mono_string);
 				var result = this.result;
 				this.result = undefined;
-				return result;
+				return { value: result, interned: interned };
 			},
 			decode: function (start, end, save) {
 				if (!MONO.mono_text_decoder) {