diff --git a/HISTORY b/HISTORY
index debff5f..c808a4f 100755
--- a/HISTORY
+++ b/HISTORY
@@ -1,3 +1,7 @@
+Dec. 18 2015
+Avoided compiling issues
+Improved compatibility with Arduino
+
 Dec. 17 2015
 Added support to evaluate a sub routine by an accessor in a PRINT statement
 Added support to get a value by an accessor in a PRINT statement
diff --git a/core/my_basic.c b/core/my_basic.c
index 18bb24e..6989f2d 100755
--- a/core/my_basic.c
+++ b/core/my_basic.c
@@ -37,7 +37,9 @@
 #	include <stdint.h>
 #endif /* _MSC_VER */
 #include <limits.h>
-#include <memory.h>
+#ifndef ARDUINO
+#	include <memory.h>
+#endif /* ARDUINO */
 #include <assert.h>
 #include <ctype.h>
 #include <math.h>
diff --git a/core/my_basic.h b/core/my_basic.h
index c2dea9c..03bf600 100755
--- a/core/my_basic.h
+++ b/core/my_basic.h
@@ -340,20 +340,20 @@ typedef enum mb_data_e {
 	MB_DT_STRING = 1 << 5,
 	MB_DT_USERTYPE = 1 << 6,
 	MB_DT_USERTYPE_REF = 1 << 7,
-	MB_DT_ARRAY = 1 << 12,
+	MB_DT_ARRAY = 1 << 8,
 #ifdef MB_ENABLE_COLLECTION_LIB
-	MB_DT_LIST = 1 << 13,
-	MB_DT_LIST_IT = 1 << 14,
-	MB_DT_DICT = 1 << 15,
-	MB_DT_DICT_IT = 1 << 16,
+	MB_DT_LIST = 1 << 9,
+	MB_DT_LIST_IT = 1 << 10,
+	MB_DT_DICT = 1 << 11,
+	MB_DT_DICT_IT = 1 << 12,
 #endif /* MB_ENABLE_COLLECTION_LIB */
 #ifdef MB_ENABLE_CLASS
-	MB_DT_CLASS = 1 << 24,
+	MB_DT_CLASS = 1 << 13,
 #endif /* MB_ENABLE_CLASS */
-	MB_DT_ROUTINE = 1 << 25
+	MB_DT_ROUTINE = 1 << 14
 } mb_data_e;
 
-typedef unsigned char mb_val_bytes_t[sizeof(void*)];
+typedef unsigned char mb_val_bytes_t[sizeof(void*) > sizeof(unsigned long) ? sizeof(void*) : sizeof(unsigned long)];
 
 typedef union mb_value_u {
 	mb_data_e type;