diff --git a/src/backend/access/gist/gistproc.c b/src/backend/access/gist/gistproc.c
index ffb1d77..15b89fd 100644
--- a/src/backend/access/gist/gistproc.c
+++ b/src/backend/access/gist/gistproc.c
@@ -17,6 +17,7 @@
  */
 #include "postgres.h"
 
+#include <float.h>
 #include <math.h>
 
 #include "access/gist.h"
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 75845ba..cbdaec9 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -13,6 +13,7 @@
  */
 #include "postgres.h"
 
+#include <float.h>
 #include <math.h>
 
 #include "access/gist_private.h"
diff --git a/src/backend/utils/adt/orderedsetaggs.c b/src/backend/utils/adt/orderedsetaggs.c
index f9f18f2..e462fbd 100644
--- a/src/backend/utils/adt/orderedsetaggs.c
+++ b/src/backend/utils/adt/orderedsetaggs.c
@@ -14,6 +14,7 @@
  */
 #include "postgres.h"
 
+#include <float.h>
 #include <math.h>
 
 #include "catalog/pg_aggregate.h"
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
index 8b05e8f..a04fd7b 100644
--- a/src/backend/utils/adt/selfuncs.c
+++ b/src/backend/utils/adt/selfuncs.c
@@ -98,6 +98,7 @@
 #include "postgres.h"
 
 #include <ctype.h>
+#include <float.h>
 #include <math.h>
 
 #include "access/gin.h"