diff --git a/src/configuration.h b/src/configuration.h
index 34fd690..97fb0e5 100644
--- a/src/configuration.h
+++ b/src/configuration.h
@@ -2,6 +2,7 @@
 #define CONFIGURATION_H
 
 #include <map>
+#include <string>
 
 namespace config
 {