diff --git a/Lib/java/std_wstring.i b/Lib/java/std_wstring.i
index 12d8fc14f..dd0b2f5ff 100644
--- a/Lib/java/std_wstring.i
+++ b/Lib/java/std_wstring.i
@@ -59,15 +59,16 @@ class wstring;
   jenv->ReleaseStringChars($input, $1_pstr);
  %}
 
-%typemap(directorin,descriptor="Ljava/lang/String;") wstring {
+%typemap(directorin,descriptor="Ljava/lang/String;") wstring %{
   jsize $1_len = $1.length();
-  jchar *conv_buf = new jchar[$1_len];
+  jchar *$1_conv_buf = new jchar[$1_len];
   for (jsize i = 0; i < $1_len; ++i) {
-    conv_buf[i] = (jchar)$1[i];
+    $1_conv_buf[i] = (jchar)$1[i];
   }
-  $input = jenv->NewString(conv_buf, $1_len);
-  delete [] conv_buf;
-}
+  $input = jenv->NewString($1_conv_buf, $1_len);
+  Swig::LocalRefGuard $1_refguard(jenv, $input);
+  delete [] $1_conv_buf;
+%}
 
 %typemap(out) wstring
 %{jsize $1_len = $1.length();
@@ -136,15 +137,16 @@ class wstring;
   $result = &$1_str;
   jenv->ReleaseStringChars($input, $1_pstr); %}
 
-%typemap(directorin,descriptor="Ljava/lang/String;") const wstring & {
+%typemap(directorin,descriptor="Ljava/lang/String;") const wstring & %{
   jsize $1_len = $1.length();
-  jchar *conv_buf = new jchar[$1_len];
+  jchar *$1_conv_buf = new jchar[$1_len];
   for (jsize i = 0; i < $1_len; ++i) {
-    conv_buf[i] = (jchar)($1)[i];
+    $1_conv_buf[i] = (jchar)($1)[i];
   }
-  $input = jenv->NewString(conv_buf, $1_len);
-  delete [] conv_buf;
-}
+  $input = jenv->NewString($1_conv_buf, $1_len);
+  Swig::LocalRefGuard $1_refguard(jenv, $input);
+  delete [] $1_conv_buf;
+%}
 
 %typemap(out) const wstring & 
 %{jsize $1_len = $1->length();