diff --git a/src/backend/columnar/columnar_tableam.c b/src/backend/columnar/columnar_tableam.c
index 01ebfe23b..e36f69a32 100644
--- a/src/backend/columnar/columnar_tableam.c
+++ b/src/backend/columnar/columnar_tableam.c
@@ -2098,7 +2098,7 @@ ColumnarProcessUtility(PlannedStmt *pstmt,
  * ColumnarSupportsIndexAM returns true if indexAM with given name is
  * supported by columnar tables.
  */
-bool
+PGDLLEXPORT bool
 ColumnarSupportsIndexAM(char *indexAMName)
 {
 	return strncmp(indexAMName, "btree", NAMEDATALEN) == 0 ||
diff --git a/src/include/columnar/columnar_tableam.h b/src/include/columnar/columnar_tableam.h
index 04f93fe30..657491ef8 100644
--- a/src/include/columnar/columnar_tableam.h
+++ b/src/include/columnar/columnar_tableam.h
@@ -56,7 +56,7 @@ extern TableScanDesc columnar_beginscan_extended(Relation relation, Snapshot sna
 												 uint32 flags, Bitmapset *attr_needed,
 												 List *scanQual);
 extern int64 ColumnarScanChunkGroupsFiltered(ColumnarScanDesc columnarScanDesc);
-extern bool ColumnarSupportsIndexAM(char *indexAMName);
+extern PGDLLEXPORT bool ColumnarSupportsIndexAM(char *indexAMName);
 extern bool IsColumnarTableAmTable(Oid relationId);
 extern void CheckCitusColumnarCreateExtensionStmt(Node *parseTree);
 extern void CheckCitusColumnarAlterExtensionStmt(Node *parseTree);