diff --git a/crypto-vala/src/srtp.vala b/crypto-vala/src/srtp.vala
index 882a8edc..22210e37 100644
--- a/crypto-vala/src/srtp.vala
+++ b/crypto-vala/src/srtp.vala
@@ -34,9 +34,8 @@ public class Session {
         if (res != ErrorStatus.ok) {
             throw new Error.UNKNOWN(@"SRTP encrypt failed: $res");
         }
-        uint8[] ret = new uint8[buf_use];
-        GLib.Memory.copy(ret, buf, buf_use);
-        return ret;
+        buf.length = buf_use;
+        return buf;
     }
 
     public uint8[] decrypt_rtp(uint8[] data) throws Error {
@@ -65,9 +64,8 @@ public class Session {
         if (res != ErrorStatus.ok) {
             throw new Error.UNKNOWN(@"SRTCP encrypt failed: $res");
         }
-        uint8[] ret = new uint8[buf_use];
-        GLib.Memory.copy(ret, buf, buf_use);
-        return ret;
+        buf.length = buf_use;
+        return buf;
     }
 
     public uint8[] decrypt_rtcp(uint8[] data) throws Error {