diff --git a/common/include/tfe_rpc.h b/common/include/tfe_rpc.h
index 1c7de0d..3d3a5b2 100644
--- a/common/include/tfe_rpc.h
+++ b/common/include/tfe_rpc.h
@@ -6,7 +6,7 @@ struct tfe_rpc_response_result{
     int status_code;
     const char* status_msg;
     char* data;
-    int len;
+    size_t len;
 };
 
 enum TFE_RPC_FLAG
diff --git a/common/src/tfe_rpc.cpp b/common/src/tfe_rpc.cpp
index d49da9a..e511ace 100644
--- a/common/src/tfe_rpc.cpp
+++ b/common/src/tfe_rpc.cpp
@@ -93,7 +93,7 @@ void read_chunk_cb(struct evhttp_request* response, void* arg)
 	{
 		return;
 	}
-    int evbuf_len = evbuffer_get_length(evbuf);
+    size_t evbuf_len = evbuffer_get_length(evbuf);
     char* data = (char*)evbuffer_pullup(evbuf, evbuf_len);
     //printf("data is %s\n", data==NULL ? "NULL":"NOT NULL");
     struct tfe_rpc_response_result* result = ALLOC(struct tfe_rpc_response_result, 1);
diff --git a/platform/src/key_keeper.cpp b/platform/src/key_keeper.cpp
index aa163fd..1124c1d 100644
--- a/platform/src/key_keeper.cpp
+++ b/platform/src/key_keeper.cpp
@@ -352,7 +352,7 @@ static void certstore_rpc_on_succ(void* result, void* user)
 	int status_code = response->status_code;
 	const char* status_msg = response->status_msg;
 	char* data = response->data;
-	int len = response->len;
+	size_t len = response->len;
 	if(status_code == HTTP_OK)
 	{
 		*(data+len) = '\0';