diff --git a/lib/curl/curl.nit b/lib/curl/curl.nit
index 18f05c865c..293d252d0e 100644
--- a/lib/curl/curl.nit
+++ b/lib/curl/curl.nit
@@ -211,10 +211,10 @@ class CurlHTTPRequest
 
 		if data != null then
 			var postdatas = data.to_url_encoded(self.curl)
-			err = self.curl.native.easy_setopt(new CURLOption.postfields, postdatas)
+			err = self.curl.native.easy_setopt(new CURLOption.copypostfields, postdatas)
 			if not err.is_ok then return err
 		else if body != null then
-			err = self.curl.native.easy_setopt(new CURLOption.postfields, body)
+			err = self.curl.native.easy_setopt(new CURLOption.copypostfields, body)
 			if not err.is_ok then return err
 		end
 		return new CURLCode.ok
diff --git a/lib/curl/native_curl.nit b/lib/curl/native_curl.nit
index d3ed43a1c2..c331a1d1f4 100644
--- a/lib/curl/native_curl.nit
+++ b/lib/curl/native_curl.nit
@@ -584,12 +584,14 @@ extern class CURLOption `{ CURLoption `}
 	# Issue a HTTP POS request.
 	new post `{ return CURLOPT_POST; `}
 
-	# Send a POST with this data.
+	# Send a POST with this data, which must remain valid until the transfer completes.
 	new postfields `{ return CURLOPT_POSTFIELDS; `}
 
+	# Send a POST with a copy of this data.
+	new copypostfields `{ return CURLOPT_COPYPOSTFIELDS; `}
+
 #	new	`{ return CURLOPT_POSTFIELDSIZE; `}
 #	new	`{ return CURLOPT_POSTFIELDSIZE_LARGE; `}
-#	new	`{ return CURLOPT_COPYPOSTFIELDS; `}
 #	new	`{ return CURLOPT_HTTPPOST; `}
 #	new	`{ return CURLOPT_REFERER; `}
 
diff --git a/lib/neo4j/curl_json.nit b/lib/neo4j/curl_json.nit
index d6c4275382..7b4cd37677 100644
--- a/lib/neo4j/curl_json.nit
+++ b/lib/neo4j/curl_json.nit
@@ -120,7 +120,7 @@ class JsonPOST
 
 		if self.json_data != null then
 			var postdatas = self.json_data.to_json
-			err = self.curl.native.easy_setopt(new CURLOption.postfields, postdatas)
+			err = self.curl.native.easy_setopt(new CURLOption.copypostfields, postdatas)
 			if not err.is_ok then return answer_failure(err.to_i, err.to_s)
 		end
 		return null
@@ -155,7 +155,7 @@ class JsonPUT
 
 		if self.json_data != null then
 			var postdatas = self.json_data.to_json
-			err = self.curl.native.easy_setopt(new CURLOption.postfields, postdatas)
+			err = self.curl.native.easy_setopt(new CURLOption.copypostfields, postdatas)
 			if not err.is_ok then return answer_failure(err.to_i, err.to_s)
 		end
 		return null