diff --git a/src/options.c b/src/options.c
index 9214f08..6ed1764 100644
--- a/src/options.c
+++ b/src/options.c
@@ -41,7 +41,7 @@ static void usage(char *s)
 {
 	struct list_head *head;
 	struct sound_driver *sd;
-	char **hlp;
+	const char *const *hlp;
 
 	printf("Usage: %s [options] [modules]\n", s);
 
@@ -100,7 +100,7 @@ static void usage(char *s)
 "   -v --verbose           Verbose mode (incremental)\n");
 }
 
-static struct option lopt[] = {
+static const struct option lopt[] = {
 	{ "amplify",		1, 0, 'a' },
 	{ "bits",		1, 0, 'b' },
 	{ "driver",		1, 0, 'd' },
diff --git a/src/sound.h b/src/sound.h
index 1d6cdec..bcdc320 100644
--- a/src/sound.h
+++ b/src/sound.h
@@ -7,9 +7,9 @@
 #include "list.h"
 
 struct sound_driver {
-	char *id;
+	const char *id;
 	char *description;
-	char **help;
+	const char *const *help;
 	int (*init)(struct options *);
         void (*deinit)(void);
 	void (*play)(void *, int);
diff --git a/src/sound_ahi.c b/src/sound_ahi.c
index 33a7ffb..ebab17c 100644
--- a/src/sound_ahi.c
+++ b/src/sound_ahi.c
@@ -68,8 +68,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"buffer=val", "Audio buffer size",
 	NULL
 };
diff --git a/src/sound_aix.c b/src/sound_aix.c
index 7cc6094..23f04f7 100644
--- a/src/sound_aix.c
+++ b/src/sound_aix.c
@@ -118,8 +118,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"gain=val", "Audio output gain (0 to 255)",
 	/* "buffer=val", "Audio buffer size (default is 32768)", */
 	NULL
diff --git a/src/sound_alsa.c b/src/sound_alsa.c
index 7981a50..5d5c0fa 100644
--- a/src/sound_alsa.c
+++ b/src/sound_alsa.c
@@ -109,8 +109,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"buffer=num", "Set the ALSA buffer time in milliseconds",
 	"period=num", "Set the ALSA period time in milliseconds",
 	"card <name>", "Select sound card to use",
diff --git a/src/sound_alsa05.c b/src/sound_alsa05.c
index 2419593..cdcb2b5 100644
--- a/src/sound_alsa05.c
+++ b/src/sound_alsa05.c
@@ -194,8 +194,7 @@ static void flush()
 	prepare_driver();
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"frag=num,size", "Set the number and size (bytes) of fragments",
 	"card <name>", "Select sound card to use",
 	NULL
diff --git a/src/sound_beos.c b/src/sound_beos.c
index 6a37bcf..93e6124 100644
--- a/src/sound_beos.c
+++ b/src/sound_beos.c
@@ -37,8 +37,7 @@ static int chunk_size;
 static int chunk_num;
 /* static int packet_size; */
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"buffer=num,size", "set the number and size of buffer fragments",
 	NULL
 };
diff --git a/src/sound_bsd.c b/src/sound_bsd.c
index f877067..bc3e8cf 100644
--- a/src/sound_bsd.c
+++ b/src/sound_bsd.c
@@ -94,7 +94,7 @@ static void onresume()
 {
 }
 
-static char *help[] = {
+static const char *const help[] = {
 	"gain=val", "Audio output gain (0 to 255)",
 	"buffer=val", "Audio buffer size (default is 32768)",
 	NULL
diff --git a/src/sound_dart.c b/src/sound_dart.c
index 0129980..1a49359 100644
--- a/src/sound_dart.c
+++ b/src/sound_dart.c
@@ -210,8 +210,7 @@ static void deinit()
 	}
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"sharing={Y,N}", "Device Sharing    (default is N)",
 	"device=val", "OS/2 Audio Device (default is 0 auto-detect)",
 	"buffer=val", "Audio buffer size (default is 16)",
diff --git a/src/sound_file.c b/src/sound_file.c
index ad1fa58..51c3d2f 100644
--- a/src/sound_file.c
+++ b/src/sound_file.c
@@ -90,7 +90,7 @@ static void onresume()
 {
 }
 
-static char *help[] = {
+static const char *const help[] = {
 	"big-endian", "Force big-endian 16-bit samples",
 	"little-endian", "Force little-endian 16-bit samples",
 	NULL
diff --git a/src/sound_hpux.c b/src/sound_hpux.c
index 67e1763..5ebf352 100644
--- a/src/sound_hpux.c
+++ b/src/sound_hpux.c
@@ -19,7 +19,7 @@
 static int audio_fd;
 
 /* Standard sampling rates */
-static int srate[] = {
+static const int srate[] = {
 	44100, 32000, 22050, 16000, 11025, 8000, 0
 };
 
@@ -139,8 +139,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"gain=val", "Audio output gain (0 to 255)",
 	"port={s|h|l}", "Audio port (s[peaker], h[eadphones], l[ineout])",
 	"buffer=val", "Audio buffer size",
diff --git a/src/sound_netbsd.c b/src/sound_netbsd.c
index ec3c81e..770cb59 100644
--- a/src/sound_netbsd.c
+++ b/src/sound_netbsd.c
@@ -122,8 +122,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"gain=val", "Audio output gain (0 to 255)",
 	"buffer=val", "Audio buffer size (default is 32768)",
 	NULL
diff --git a/src/sound_oss.c b/src/sound_oss.c
index 7f38153..e728042 100644
--- a/src/sound_oss.c
+++ b/src/sound_oss.c
@@ -109,7 +109,7 @@ static void setaudio(int *rate, int *format)
 static int init(struct options *options)
 {
 	char **parm = options->driver_parm;
-	char *dev_audio[] = { "/dev/dsp", "/dev/sound/dsp" };
+	static const char *dev_audio[] = { "/dev/dsp", "/dev/sound/dsp" };
 	audio_buf_info info;
 	static char buf[80];
 	int i;
@@ -192,7 +192,7 @@ static void onresume()
 #endif
 }
 
-static char *help[] = {
+static const char *const help[] = {
 	"frag=num,size", "Set the number and size of fragments",
 	"dev=<device_name>", "Audio device to use (default /dev/dsp)",
 	"nosync", "Don't flush OSS buffers between modules",
diff --git a/src/sound_qnx.c b/src/sound_qnx.c
index ede29a0..b6311ee 100644
--- a/src/sound_qnx.c
+++ b/src/sound_qnx.c
@@ -105,8 +105,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"dev=<device_name>", "Audio device name (default is /dev/dsp)",
 	"buffer=val", "Audio buffer size (default is 32768)",
 	NULL
diff --git a/src/sound_sgi.c b/src/sound_sgi.c
index cbe9063..cff8016 100644
--- a/src/sound_sgi.c
+++ b/src/sound_sgi.c
@@ -23,7 +23,7 @@ static int al_sample_16;
  * audio port sample rates (these are the only ones supported by the library)
  */
 
-static int srate[] = {
+static const int srate[] = {
 	48000,
 	44100,
 	32000,
@@ -167,8 +167,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"buffer=val", "Audio buffer size",
 	NULL
 };
diff --git a/src/sound_solaris.c b/src/sound_solaris.c
index 6e5b8a1..d8254e7 100644
--- a/src/sound_solaris.c
+++ b/src/sound_solaris.c
@@ -170,8 +170,7 @@ static void onresume()
 {
 }
 
-
-static char *help[] = {
+static const char *const help[] = {
 	"gain=val", "Audio output gain (0 to 255)",
 	"port={s|h|l}", "Audio port (s[peaker], h[eadphones], l[ineout])",
 	"buffer=val", "Audio buffer size (default is 32768)",
diff --git a/src/sound_win32.c b/src/sound_win32.c
index 6f60e0a..4edc1f0 100644
--- a/src/sound_win32.c
+++ b/src/sound_win32.c
@@ -163,7 +163,7 @@ static void onresume()
 {
 }
 
-static char *help[] = {
+static const char *const help[] = {
 	"buffers=val", "Number of buffers (default 10)",
 	NULL
 };