diff --git a/src/values/Buffer.cpp b/src/values/Buffer.cpp
index 1df5f79..b6ad905 100644
--- a/src/values/Buffer.cpp
+++ b/src/values/Buffer.cpp
@@ -41,7 +41,7 @@ bool Buffer::resize(size_t new_size)
 uint32_t Buffer::add_end(uint8_t *data, size_t data_size)
 {
 	if (taken + data_size > size)
-		if (!resize(size + data_size))
+		if (!resize((size + data_size) * 2))
 			return -1;
 
 	memcpy(buffer + taken, data, data_size);
@@ -52,7 +52,7 @@ uint32_t Buffer::add_end(uint8_t *data, size_t data_size)
 int Buffer::add_middle(uint8_t *data, size_t data_size, size_t index)
 {
 	if (taken + data_size > size)
-		if (!resize(size + data_size))
+		if (!resize((size + data_size) * 2))
 			return -1;
 	memmove(buffer + index + data_size, buffer + index, taken - index);
 	memcpy(buffer + index, data, data_size);