--- a/wave.c
+++ b/wave.c
@@ -1,11 +1,26 @@
 #include <stdio.h>
 #include <string.h>
+#include <endian.h>
 #include "wave.h"
 
 int read_header (FILE *f, waveheaderstruct *header)
 {
+	waveheaderstruct h;
 	fseek (f, 0, SEEK_SET);
-	return fread (header, 1, sizeof (waveheaderstruct), f);
+	size_t red = fread (&h, 1, sizeof (waveheaderstruct), f);
+	
+	h.length = le32toh(h.length);
+	h.length_chunk = le32toh(h.length_chunk);
+	h.format = le16toh(h.format);
+	h.modus = le16toh(h.modus);
+	h.sample_fq = le32toh(h.sample_fq);
+	h.byte_p_sec = le32toh(h.byte_p_sec);
+	h.byte_p_spl = le16toh(h.byte_p_spl);
+	h.bit_p_spl = le16toh(h.bit_p_spl);
+	h.data_length = le32toh(h.data_length);
+	
+	*header = h;
+	return red;
 }
 
 int read_frames (FILE *f, int start, int length, char *data)
@@ -52,12 +67,12 @@
 	
 	read_header (f, &header);
 	
-	printf ("Length: %lu\n", header.length);
-	printf ("Length Chunk: %lu\n", header.length_chunk);
+	printf ("Length: %lu\n", (unsigned long)header.length);
+	printf ("Length Chunk: %lu\n", (unsigned long)header.length_chunk);
 	printf ("Format: %u\n", header.format);
 	printf ("Modus: %u\n", header.modus);
-	printf ("Sample Frequency: %lu\n", header.sample_fq);
-	printf ("Bytes per Second: %lu\n", header.byte_p_sec);
+	printf ("Sample Frequency: %lu\n", (unsigned long)header.sample_fq);
+	printf ("Bytes per Second: %lu\n", (unsigned long)header.byte_p_sec);
 	printf ("Bytes per Sample: %u\n", header.byte_p_spl);
-	printf ("Data Length: %lu\n", header.data_length);
+	printf ("Data Length: %lu\n", (unsigned long)header.data_length);
 }
--- a/wave.h
+++ b/wave.h
@@ -22,24 +22,25 @@
 #ifndef WAVE_H
 #define WAVE_H
 
-typedef unsigned long ulongT;
-typedef unsigned short ushortT;
+#include <stdint.h>
 
+#pragma pack(push,1)
 typedef struct {		/* header for WAV-Files */
-	char		main_chunk[4];	/* 'RIFF' */
-	unsigned long	length;		/* length of file */
-	char		chunk_type[4];	/* 'WAVE' */
-	char		sub_chunk[4];	/* 'fmt' */
-	unsigned long	length_chunk;	/* length sub_chunk, always 16 bytes */
-	unsigned short	format;		/* always 1 = PCM-Code */
-	unsigned short	modus;		/* 1 = Mono, 2 = Stereo */
-	unsigned long	sample_fq;	/* Sample Freq */
-	unsigned long	byte_p_sec;	/* Data per sec */
-	unsigned short	byte_p_spl;	/* Bytes per sample */
-	unsigned short	bit_p_spl;	/* bits per sample, 8, 12, 16 */
-	char		data_chunk[4];	/* 'data' */
-	unsigned long	data_length;	/* length of data */
-} waveheaderstruct;
+	uint8_t		main_chunk[4];	/* 'RIFF' */
+	uint32_t	length;		/* length of file */
+	uint8_t		chunk_type[4];	/* 'WAVE' */
+	uint8_t		sub_chunk[4];	/* 'fmt' */
+	uint32_t	length_chunk;	/* length sub_chunk, always 16 bytes */
+	uint16_t	format;		/* always 1 = PCM-Code */
+	uint16_t	modus;		/* 1 = Mono, 2 = Stereo */
+	uint32_t	sample_fq;	/* Sample Freq */
+	uint32_t	byte_p_sec;	/* Data per sec */
+	uint16_t	byte_p_spl;	/* Bytes per sample */
+	uint16_t	bit_p_spl;	/* bits per sample, 8, 12, 16 */
+	uint8_t		data_chunk[4];	/* 'data' */
+	uint32_t	data_length;	/* length of data */
+} __attribute__ ((__packed__)) waveheaderstruct;
+#pragma pack(pop)
 
 int read_header (FILE *f, waveheaderstruct *header);
 int read_frames (FILE *f, int start, int length, char *data);
--- a/spectromatic.c
+++ b/spectromatic.c
@@ -217,7 +217,7 @@
 		if (header.modus == 2)
 			ch2 = (double*) malloc (window_size * sizeof (double));
 
-		fprintf (stderr, "samples = %li, step_size = %i, window_size = %i\n", header.data_length / header.byte_p_spl, step_size, window_size);
+		fprintf (stderr, "samples = %lu, step_size = %i, window_size = %i\n", (unsigned long)header.data_length / header.byte_p_spl, step_size, window_size);
 
 		for (i = -window_size; i < window_size + (int)(header.data_length / header.byte_p_spl); i += step_size) {
 			read_frames (f, i, window_size, data);