diff --git a/src/vector.c b/src/vector.c
index 2710d21..9174942 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -16,6 +16,10 @@
 #include "utils/float.h"
 #endif
 
+#if PG_VERSION_NUM < 130000
+#define TYPALIGN_INT 'i'
+#endif
+
 PG_MODULE_MAGIC;
 
 /*