diff --git a/lib/gssapi/Makefile.am b/lib/gssapi/Makefile.am
index 8239ef106..fa8c01fbf 100644
--- a/lib/gssapi/Makefile.am
+++ b/lib/gssapi/Makefile.am
@@ -106,6 +106,7 @@ mechsrc = \
 	mech/gss_duplicate_cred.c \
 	mech/gss_duplicate_name.c \
 	mech/gss_duplicate_oid.c \
+	mech/gss_duplicate_oid_set.c \
 	mech/gss_encapsulate_token.c \
 	mech/gss_export_name.c \
 	mech/gss_export_name_composite.c \
diff --git a/lib/gssapi/NTMakefile b/lib/gssapi/NTMakefile
index 61dc7e5d8..e153a0ce2 100644
--- a/lib/gssapi/NTMakefile
+++ b/lib/gssapi/NTMakefile
@@ -123,6 +123,7 @@ mechsrc = \
 	mech/gss_duplicate_name.c \
 	mech/gss_duplicate_cred.c \
 	mech/gss_duplicate_oid.c \
+	mech/gss_duplicate_oid_set.c \
 	mech/gss_encapsulate_token.c \
 	mech/gss_export_name.c \
 	mech/gss_export_name_composite.c \
@@ -372,6 +373,7 @@ libgssapi_OBJs = \
 	$(OBJ)\mech/gss_duplicate_cred.obj \
 	$(OBJ)\mech/gss_duplicate_name.obj \
 	$(OBJ)\mech/gss_duplicate_oid.obj \
+	$(OBJ)\mech/gss_duplicate_oid_set.obj \
 	$(OBJ)\mech/gss_encapsulate_token.obj \
 	$(OBJ)\mech/gss_export_name.obj \
 	$(OBJ)\mech/gss_export_name_composite.obj \
diff --git a/lib/gssapi/gssapi/gssapi.h b/lib/gssapi/gssapi/gssapi.h
index 66fed6682..4180cd3ee 100644
--- a/lib/gssapi/gssapi/gssapi.h
+++ b/lib/gssapi/gssapi/gssapi.h
@@ -751,6 +751,12 @@ GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_duplicate_oid (
 	    gss_OID * /* dest_oid */
            );
 
+GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_duplicate_oid_set (
+	    OM_uint32 * /* minor_status */,
+	    gss_OID_set /* src_oid */,
+	    gss_OID_set * /* dest_oid */
+           );
+
 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 gss_release_oid
 	(OM_uint32 * /*minor_status*/,
diff --git a/lib/gssapi/libgssapi-exports.def b/lib/gssapi/libgssapi-exports.def
index f54471cd4..1f72489da 100644
--- a/lib/gssapi/libgssapi-exports.def
+++ b/lib/gssapi/libgssapi-exports.def
@@ -34,6 +34,7 @@ EXPORTS
 	gss_display_status
 	gss_duplicate_name
 	gss_duplicate_oid
+	gss_duplicate_oid_set
 	gss_encapsulate_token
         gss_export_cred
 	gss_export_name
diff --git a/lib/gssapi/mech/gss_duplicate_oid_set.c b/lib/gssapi/mech/gss_duplicate_oid_set.c
new file mode 100644
index 000000000..ae0ab8d08
--- /dev/null
+++ b/lib/gssapi/mech/gss_duplicate_oid_set.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2020 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "mech_locl.h"
+
+GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
+gss_duplicate_oid_set(OM_uint32 *minor_status,
+                      gss_OID_set src_oid_set,
+                      gss_OID_set *dest_oid_set)
+{
+    OM_uint32 major_status, junk;
+    size_t i;
+
+    *dest_oid_set = GSS_C_NO_OID_SET;
+
+    major_status = gss_create_empty_oid_set(minor_status, dest_oid_set);
+
+    for (i = 0; major_status == GSS_S_COMPLETE && i < src_oid_set->count; i++)
+	major_status = gss_add_oid_set_member(minor_status,
+					      &src_oid_set->elements[i],
+					      dest_oid_set);
+
+    if (major_status != GSS_S_COMPLETE)
+        gss_release_oid_set(&junk, dest_oid_set);
+
+    return major_status;
+}
diff --git a/lib/gssapi/version-script.map b/lib/gssapi/version-script.map
index 59c76a3d1..26c9570a8 100644
--- a/lib/gssapi/version-script.map
+++ b/lib/gssapi/version-script.map
@@ -37,6 +37,7 @@ HEIMDAL_GSS_2.0 {
 		gss_display_status;
 		gss_duplicate_name;
 		gss_duplicate_oid;
+		gss_duplicate_oid_set;
 		gss_encapsulate_token;
 		gss_export_cred;
 		gss_export_name;