diff --git a/src/hnsw.h b/src/hnsw.h
index 77147d1..7ab09d2 100644
--- a/src/hnsw.h
+++ b/src/hnsw.h
@@ -6,6 +6,7 @@
 #include "access/generic_xlog.h"
 #include "access/parallel.h"
 #include "access/reloptions.h"
+#include "lib/pairingheap.h"
 #include "nodes/execnodes.h"
 #include "port.h"				/* for random() */
 #include "utils/relptr.h"
diff --git a/src/hnswbuild.c b/src/hnswbuild.c
index d367a93..3fbb78d 100644
--- a/src/hnswbuild.c
+++ b/src/hnswbuild.c
@@ -46,7 +46,6 @@
 #include "commands/progress.h"
 #include "hnsw.h"
 #include "miscadmin.h"
-#include "lib/pairingheap.h"
 #include "optimizer/optimizer.h"
 #include "storage/bufmgr.h"
 #include "tcop/tcopprot.h"
diff --git a/src/hnswutils.c b/src/hnswutils.c
index 98d4710..e219530 100644
--- a/src/hnswutils.c
+++ b/src/hnswutils.c
@@ -3,6 +3,7 @@
 #include <math.h>
 
 #include "hnsw.h"
+#include "lib/pairingheap.h"
 #include "storage/bufmgr.h"
 #include "utils/datum.h"
 #include "vector.h"
diff --git a/src/ivfflat.h b/src/ivfflat.h
index b35d8a5..366fc44 100644
--- a/src/ivfflat.h
+++ b/src/ivfflat.h
@@ -6,6 +6,7 @@
 #include "access/generic_xlog.h"
 #include "access/parallel.h"
 #include "access/reloptions.h"
+#include "lib/pairingheap.h"
 #include "nodes/execnodes.h"
 #include "port.h"				/* for random() */
 #include "utils/sampling.h"
diff --git a/src/ivfscan.c b/src/ivfscan.c
index 5f612db..5e69c39 100644
--- a/src/ivfscan.c
+++ b/src/ivfscan.c
@@ -5,6 +5,7 @@
 #include "access/relscan.h"
 #include "catalog/pg_operator_d.h"
 #include "catalog/pg_type_d.h"
+#include "lib/pairingheap.h"
 #include "ivfflat.h"
 #include "miscadmin.h"
 #include "pgstat.h"