1 files changed, 1 insertions, 0 deletions

diff --git a/error.h b/error.h
index 6467109e..ca5663a9 100644
--- a/error.h
+++ b/error.h
@@ -5,6 +5,7 @@
 
 #include <exception>
 #include <string>
+#include <sstream>
 
 namespace ledger {