diff --git a/src/story_gui.cpp b/src/story_gui.cpp
index 1e0bc09da6..df1a049752 100644
--- a/src/story_gui.cpp
+++ b/src/story_gui.cpp
@@ -332,6 +332,7 @@ protected:
 			default:
 				NOT_REACHED();
 		}
+		return 0;
 	}
 
 	/**