diff --git a/src/core/parsers/common/file_system.cpp b/src/core/parsers/common/file_system.cpp
index 5292cea7..4161a7b6 100644
--- a/src/core/parsers/common/file_system.cpp
+++ b/src/core/parsers/common/file_system.cpp
@@ -2,6 +2,7 @@
 
 #include <string>
 #include <fstream>
+#include <sstream>
 
 
 namespace dlplan::core::parsers {