diff --git a/common/faction.cpp b/common/faction.cpp
index c387f8453..65524f623 100644
--- a/common/faction.cpp
+++ b/common/faction.cpp
@@ -19,8 +19,6 @@
 #include "faction.h"
 #include "races.h"
 
-#include <string>
-
 const char *FactionValueToString(FACTION_VALUE fv)
 {
 	switch (fv) {
diff --git a/common/faction.h b/common/faction.h
index a455b81e6..c98fc0916 100644
--- a/common/faction.h
+++ b/common/faction.h
@@ -21,6 +21,7 @@
 #include "types.h"
 #include "features.h"
 #include <map>
+#include <string>
 
 enum FACTION_VALUE {
 	FACTION_ALLY = 1,