diff --git a/src/vector.c b/src/vector.c
index d232a23..fa5cbca 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -822,7 +822,7 @@ vector_accum(PG_FUNCTION_ARGS)
 	if (newarr)
 	{
 		for (int i = 0; i < dim; i++)
-			statedatums[i + 1] = Float8GetDatumFast(x[i]);
+			statedatums[i + 1] = Float8GetDatumFast((double) x[i]);
 	}
 	else
 	{
diff --git a/src/vector.h b/src/vector.h
index 3e41130..93aeb6a 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -3,6 +3,10 @@
 
 #include "postgres.h"
 
+#if PG_VERSION_NUM >= 160000
+#include "varatt.h"
+#endif
+
 #define VECTOR_MAX_DIM 16000
 
 #define VECTOR_SIZE(_dim)		(offsetof(Vector, x) + sizeof(float)*(_dim))