diff --git a/main.cpp b/main.cpp
index f644115..a064275 100644
--- a/main.cpp
+++ b/main.cpp
@@ -3,6 +3,8 @@
 #include "histogram.h"
 #include "text.h"
 #include "svg.h"
+#include <curl/curl.h>
+
 using namespace std;
 
 struct Input {
@@ -32,6 +34,7 @@ input_data(istream& in, bool prompt) {
 
 int
 main() {
+    curl_global_init(CURL_GLOBAL_ALL);
     auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);