diff --git a/grapher/lib/grapher/utils/cli.cpp b/grapher/lib/grapher/utils/cli.cpp
index 1fc3a6a..a9b1711 100644
--- a/grapher/lib/grapher/utils/cli.cpp
+++ b/grapher/lib/grapher/utils/cli.cpp
@@ -1,6 +1,7 @@
 #include <algorithm>
 #include <filesystem>
 #include <fstream>
+#include <sstream>
 
 #include <llvm/Support/raw_ostream.h>