diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 43549c2..f78503f 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -233,14 +233,6 @@ static TupleDesc GetPgIndexDescriptor(void);
 static void AttrDefaultFetch(Relation relation);
 static void CheckConstraintFetch(Relation relation);
 static List *insert_ordered_oid(List *list, Oid datum);
-static void IndexSupportInitialize(oidvector *indclass,
-					   Oid *indexOperator,
-					   RegProcedure *indexSupport,
-					   Oid *opFamily,
-					   Oid *opcInType,
-					   StrategyNumber maxStrategyNumber,
-					   StrategyNumber maxSupportNumber,
-					   AttrNumber maxAttributeNumber);
 static OpClassCacheEnt *LookupOpclassInfo(Oid operatorClassOid,
 				  StrategyNumber numStrats,
 				  StrategyNumber numSupport);
@@ -1140,7 +1132,7 @@ RelationInitIndexAccessInfo(Relation relation)
  * those obtainable from the system catalog entries for the index and
  * access method.
  */
-static void
+void
 IndexSupportInitialize(oidvector *indclass,
 					   Oid *indexOperator,
 					   RegProcedure *indexSupport,
diff --git a/src/include/utils/relcache.h b/src/include/utils/relcache.h
index 5314fc2..3984296 100644
--- a/src/include/utils/relcache.h
+++ b/src/include/utils/relcache.h
@@ -14,6 +14,7 @@
 #ifndef RELCACHE_H
 #define RELCACHE_H
 
+#include "access/skey.h"				/* for StrategyNumber */
 #include "access/tupdesc.h"
 #include "nodes/bitmapset.h"
 #include "nodes/pg_list.h"
@@ -109,4 +110,14 @@ extern bool criticalRelcachesBuilt;
 /* should be used only by relcache.c and postinit.c */
 extern bool criticalSharedRelcachesBuilt;
 
+/* Exposed as a global for the benefit of Index Advisor. */
+extern void IndexSupportInitialize(oidvector *indclass,
+					   Oid *indexOperator,
+					   RegProcedure *indexSupport,
+					   Oid *opFamily,
+					   Oid *opcInType,
+					   StrategyNumber maxStrategyNumber,
+					   StrategyNumber maxSupportNumber,
+					   AttrNumber maxAttributeNumber);
+
 #endif   /* RELCACHE_H */