diff --git a/Adafruit_TSL2561_U.cpp b/Adafruit_TSL2561_U.cpp
index 1cbe777..f08f92d 100644
--- a/Adafruit_TSL2561_U.cpp
+++ b/Adafruit_TSL2561_U.cpp
@@ -39,7 +39,7 @@
 /**************************************************************************/
 
 #include "Adafruit_TSL2561_U.h"
-
+#include "avr/delay.h"
 
 /*========================================================================*/
 /*                            CONSTRUCTORS                                */
diff --git a/pgmspace.h b/pgmspace.h
deleted file mode 100644
index c4fb2e4..0000000
--- a/pgmspace.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/**************************************************************************/
-/*! 
-    @file     pgmspace.h
-    @author   Mike Roberts
-
-    @section LICENSE
-
-    Software License Agreement (BSD License)
-
-    Copyright (c) 2013, Mike Roberts
-    All rights reserved.
-
-    Redistribution and use in source and binary forms, with or without
-    modification, are permitted provided that the following conditions are met:
-    1. Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
-    2. Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
-    3. Neither the name of the copyright holders nor the
-    names of its contributors may be used to endorse or promote products
-    derived from this software without specific prior written permission.
-
-    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
-    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
-    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-/**************************************************************************/
-
-#ifndef delorean_pgmspace_h
-#define delorean_pgmspace_h
-
-#include <inttypes.h>
-
-#define PROGMEM
-#define PGM_P const char *
-#define PSTR(str) (str)
-
-typedef void prog_void;
-typedef char prog_char;
-typedef unsigned char prog_uchar;
-typedef int8_t prog_int8_t;
-typedef uint8_t prog_uint8_t;
-typedef int16_t prog_int16_t;
-typedef uint16_t prog_uint16_t;
-typedef int32_t prog_int32_t;
-typedef uint32_t prog_uint32_t;
-
-#define strcpy_P(dest, src) strcpy((dest), (src))
-#define strcat_P(dest, src) strcat((dest), (src))
-#define strcmp_P(a, b) strcmp((a), (b))
-
-#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
-#define pgm_read_word(addr) (*(const unsigned short *)(addr))
-#define pgm_read_dword(addr) (*(const unsigned long *)(addr))
-#define pgm_read_float(addr) (*(const float *)(addr))
-
-#define pgm_read_byte_near(addr) pgm_read_byte(addr)
-#define pgm_read_word_near(addr) pgm_read_word(addr)
-#define pgm_read_dword_near(addr) pgm_read_dword(addr)
-#define pgm_read_float_near(addr) pgm_read_float(addr)
-#define pgm_read_byte_far(addr) pgm_read_byte(addr)
-#define pgm_read_word_far(addr) pgm_read_word(addr)
-#define pgm_read_dword_far(addr) pgm_read_dword(addr)
-#define pgm_read_float_far(addr) pgm_read_float(addr)
-
-#endif