diff --git a/generator.cpp b/generator.cpp
index de51f1b..2780e93 100644
--- a/generator.cpp
+++ b/generator.cpp
@@ -163,6 +163,8 @@ auto Generator::generate_random_data(uint n) -> std::string {
 		std::string nu_G_k{generate_blocks(2)};
 		// fmt::print("nu_G_k: {}\n", nu_G_k); // debugging
 		std::string dst;
+		// FIXME: +1 for the actual null-termination, not exactly sure if needed
+		dst.resize(G.k_length + 1);
 		CryptoPP::StringSource str_s(
 			nu_G_k,true,new CryptoPP::HexDecoder(new CryptoPP::StringSink(dst))
 		);