4 files changed, 3 insertions, 9 deletions
diff --git a/src/include/pp.h b/src/include/pp.h
index d82907c..4ab4f94 100644
--- a/src/include/pp.h
+++ b/src/include/pp.h
@@ -1,9 +1,6 @@
 #ifndef PP_H
 #define PP_H
 
-#include <stdlib.h>
-#include <string.h>
-
 #include "util.h"
 #include "syntax.h"
 
diff --git a/src/include/source.h b/src/include/source.h
index ff9f150..1fe9c41 100644
--- a/src/include/source.h
+++ b/src/include/source.h
@@ -1,9 +1,7 @@
 #ifndef SOURCE_H
 #define SOURCE_H
 
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
+#include "util.h"
 
 char* source_get(char* arg);
 char* source_get_from_stdin();
diff --git a/src/include/tree.h b/src/include/tree.h
index d19f1f7..d529bff 100644
--- a/src/include/tree.h
+++ b/src/include/tree.h
@@ -1,7 +1,7 @@
 #ifndef TREE_H
 #define TREE_H
 
-#include <stdlib.h>
+#include "util.h"
 
 typedef struct TREE {
    enum TREE_TYPE {
diff --git a/src/include/util.h b/src/include/util.h
index cfc85c2..854d18d 100644
--- a/src/include/util.h
+++ b/src/include/util.h
@@ -1,12 +1,11 @@
 #ifndef UTIL_H
 #define UTIL_H
 
+#include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
-#include <stdlib.h>
 #include <stdio.h>
 
-
 /* log some debug information */
 void log_dbg(const char*, ...);
 /* log some information */