diff --git a/contrib/unaccent/unaccent.c b/contrib/unaccent/unaccent.c
index 247c202755..dbf2bb9602 100644
--- a/contrib/unaccent/unaccent.c
+++ b/contrib/unaccent/unaccent.c
@@ -20,7 +20,9 @@
 #include "tsearch/ts_locale.h"
 #include "tsearch/ts_public.h"
 #include "utils/builtins.h"
+#include "utils/lsyscache.h"
 #include "utils/regproc.h"
+#include "utils/syscache.h"
 
 PG_MODULE_MAGIC;
 
@@ -376,7 +378,21 @@ unaccent_dict(PG_FUNCTION_ARGS)
 
 	if (PG_NARGS() == 1)
 	{
-		dictOid = get_ts_dict_oid(stringToQualifiedNameList("unaccent"), false);
+		/*
+		 * Use the "unaccent" dictionary that is in the same schema that this
+		 * function is in.
+		 */
+		Oid			procnspid = get_func_namespace(fcinfo->flinfo->fn_oid);
+		const char *dictname = "unaccent";
+
+		dictOid = GetSysCacheOid2(TSDICTNAMENSP,
+								  PointerGetDatum(dictname),
+								  ObjectIdGetDatum(procnspid));
+		if (!OidIsValid(dictOid))
+			ereport(ERROR,
+					(errcode(ERRCODE_UNDEFINED_OBJECT),
+					 errmsg("text search dictionary \"%s.%s\" does not exist",
+							get_namespace_name(procnspid), dictname)));
 		strArg = 0;
 	}
 	else
diff --git a/doc/src/sgml/unaccent.sgml b/doc/src/sgml/unaccent.sgml
index a7f5f53041..547ac54a71 100644
--- a/doc/src/sgml/unaccent.sgml
+++ b/doc/src/sgml/unaccent.sgml
@@ -174,12 +174,14 @@ mydb=# select ts_headline('fr','Hôtel de la Mer',to_tsquery('fr','Hotels')
  </indexterm>
 
 <synopsis>
-unaccent(<optional><replaceable class="parameter">dictionary</replaceable>, </optional> <replaceable class="parameter">string</replaceable>) returns <type>text</type>
+unaccent(<optional><replaceable class="parameter">dictionary</replaceable> <type>regdictionary</type>, </optional> <replaceable class="parameter">string</replaceable> <type>text</type>) returns <type>text</type>
 </synopsis>
 
  <para>
   If the <replaceable class="parameter">dictionary</replaceable> argument is
-  omitted, <literal>unaccent</literal> is assumed.
+  omitted, the text search dictionary named <literal>unaccent</literal> and
+  appearing in the same schema as the <function>unaccent()</function>
+  function itself is used.
  </para>
 
  <para>