--- src/include/postgres.h	2017-05-15 17:20:59.000000000 -0400
+++ src/include/postgres.h	2017-05-31 00:21:27.329393499 -0400
@@ -679,7 +679,7 @@
 		float4		retval;
 	}			myunion;
 
-	myunion.value = GET_4_BYTES(X);
+	myunion.value = (int32)GET_4_BYTES(X);
 	return myunion.retval;
 }
 #else