diff --git a/Source/Engine/Gramambular/Bigram.h b/Source/Engine/Gramambular/Bigram.h
index 194ea755..42ac9033 100644
--- a/Source/Engine/Gramambular/Bigram.h
+++ b/Source/Engine/Gramambular/Bigram.h
@@ -28,6 +28,8 @@
 #ifndef Bigram_h
 #define Bigram_h
 
+#include <vector>
+
 #include "KeyValuePair.h"
 
 namespace Formosa {
diff --git a/Source/Engine/Gramambular/BlockReadingBuilder.h b/Source/Engine/Gramambular/BlockReadingBuilder.h
index f6909b06..ed6fd173 100644
--- a/Source/Engine/Gramambular/BlockReadingBuilder.h
+++ b/Source/Engine/Gramambular/BlockReadingBuilder.h
@@ -199,7 +199,7 @@ namespace Formosa {
             }
         }
         
-        const string BlockReadingBuilder::Join(vector<string>::const_iterator begin, vector<string>::const_iterator end, const string& separator)
+        inline const string BlockReadingBuilder::Join(vector<string>::const_iterator begin, vector<string>::const_iterator end, const string& separator)
         {
             string result;
             for (vector<string>::const_iterator iter = begin ; iter != end ; ) {
diff --git a/Source/Engine/Gramambular/KeyValuePair.h b/Source/Engine/Gramambular/KeyValuePair.h
index ea6fd33d..0abbb891 100644
--- a/Source/Engine/Gramambular/KeyValuePair.h
+++ b/Source/Engine/Gramambular/KeyValuePair.h
@@ -28,6 +28,7 @@
 #ifndef KeyValuePair_h
 #define KeyValuePair_h
 
+#include <ostream>
 #include <string>
 
 namespace Formosa {