diff --git a/libretroshare/src/rsserver/p3peers.cc b/libretroshare/src/rsserver/p3peers.cc
index 50c026c7c..35be7e728 100644
--- a/libretroshare/src/rsserver/p3peers.cc
+++ b/libretroshare/src/rsserver/p3peers.cc
@@ -1553,7 +1553,7 @@ std::string p3Peers::GetRetroshareInvite(
 		}
 
 		RsCertificate cert(detail, mem_block, mem_block_size);
-		delete[] mem_block;
+		free(mem_block);
 
 		return cert.toStdString();
 	}