diff --git a/src/cc/error.h b/src/cc/error.h
index c1d80ab..98a4a10 100644
--- src/cc/error.h
+++ src/cc/error.h
@@ -21,6 +21,7 @@
 #ifndef cc__error_h
 #define cc__error_h
 
+#include <iostream>
 #include <ccinternal>
 
 #include <boost/exception/diagnostic_information.hpp>
diff --git a/src/cc/log.h b/src/cc/log.h
index 2b2c986..77708f5 100644
--- src/cc/log.h
+++ src/cc/log.h
@@ -21,6 +21,7 @@
 #ifndef cc__log_h
 #define cc__log_h
 
+#include <iostream>
 #include <ccinternal>
 
 #include <boost/iostreams/filtering_stream.hpp>
diff --git a/src/cc/options.h b/src/cc/options.h
index 6c45ce8..d757bfb 100644
--- src/cc/options.h
+++ src/cc/options.h
@@ -21,6 +21,8 @@
 #ifndef cc__options_h
 #define cc__options_h
 
+#include <iostream>
+
 #include <ccinternal>
 
 #include <boost/program_options/options_description.hpp>