diff --git a/source/code/DialogBox.hpp b/source/code/DialogBox.hpp
index 5024eb4..d8d4272 100644
--- a/source/code/DialogBox.hpp
+++ b/source/code/DialogBox.hpp
@@ -77,5 +77,7 @@ private:
 	int oldmousey = 0;
 };
 
+void DrawRectYellow(SDL_Renderer* target, int topx, int topy, int height, int width);
+
 #endif /* DIALOGBOX_HPP */
 
diff --git a/source/code/HelpAboutState.cpp b/source/code/HelpAboutState.cpp
index eef7557..fdbd027 100644
--- a/source/code/HelpAboutState.cpp
+++ b/source/code/HelpAboutState.cpp
@@ -21,6 +21,7 @@ https://blockattack.net
 ===========================================================================
 */
 
+#include "DialogBox.hpp"
 #include "HelpCommon.hpp"
 #include "HelpAboutState.hpp"
 #include "global.hpp"
@@ -94,8 +95,6 @@ void HelpAboutState::ProcessInput(const SDL_Event& event, bool& processed) {
 	}
 }
 
-extern void DrawRectYellow(SDL_Renderer* target, int topx, int topy, int height, int width);
-
 void HelpAboutState::Draw(SDL_Renderer* target) {
 	DrawBackground(target);
 	titleField.Draw(target, 50, 50);
diff --git a/source/code/HelpCommon.hpp b/source/code/HelpCommon.hpp
index 5746155..1f2be04 100644
--- a/source/code/HelpCommon.hpp
+++ b/source/code/HelpCommon.hpp
@@ -21,6 +21,10 @@ https://blockattack.net
 ===========================================================================
 */
 
+
+#ifndef _HELP_COMMON_HPP
+#define _HELP_COMMON_HPP
+
 #include "sago/SagoTextBox.hpp"
 #include "sago/SagoTextField.hpp"
 
@@ -29,3 +33,5 @@ void setHelp30Font(const sago::SagoDataHolder* holder, sago::SagoTextField& fiel
 void setHelp30Font(const sago::SagoDataHolder* holder, sago::SagoTextBox& field, const char* text);
 
 void setHelpBoxFont(const sago::SagoDataHolder* holder, sago::SagoTextBox& field, const char* text);
+
+#endif  //_HELP_COMMON_HPP
diff --git a/source/code/ShowFileState.cpp b/source/code/ShowFileState.cpp
index e80e446..dfd574f 100644
--- a/source/code/ShowFileState.cpp
+++ b/source/code/ShowFileState.cpp
@@ -17,6 +17,7 @@ https://blockattack.net
 ===========================================================================
 */
 
+#include "DialogBox.hpp"
 #include "HelpCommon.hpp"
 #include "ShowFileState.hpp"
 #include "global.hpp"
@@ -58,8 +59,6 @@ void ShowFileState::ProcessInput(const SDL_Event& event, bool& processed) {
 	}
 }
 
-extern void DrawRectYellow(SDL_Renderer* target, int topx, int topy, int height, int width);
-
 void ShowFileState::Draw(SDL_Renderer* target) {
 	DrawBackground(target);
 	titleField.Draw(target, 50, 50);