diff --git a/module.h b/module.h
index e525c87..5f1bc7c 100644
--- a/module.h
+++ b/module.h
@@ -27,7 +27,7 @@ struct module {
      * specified number of milliseconds */
     bool (*refresh_in)(struct module *mod, long milli_seconds);
 
-    const char *(*description)(struct module *mod);
+    const char *(*description)(const struct module *mod);
 };
 
 struct module *module_common_new(void);
diff --git a/modules/alsa.c b/modules/alsa.c
index b3aaba8..6003ae6 100644
--- a/modules/alsa.c
+++ b/modules/alsa.c
@@ -84,10 +84,10 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     static char desc[32];
-    struct private *m = mod->private;
+    const struct private *m = mod->private;
     snprintf(desc, sizeof(desc), "alsa(%s)", m->card);
     return desc;
 }
diff --git a/modules/backlight.c b/modules/backlight.c
index af58280..9f26a14 100644
--- a/modules/backlight.c
+++ b/modules/backlight.c
@@ -40,7 +40,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "backlight";
 }
diff --git a/modules/battery.c b/modules/battery.c
index 0833310..c4f949c 100644
--- a/modules/battery.c
+++ b/modules/battery.c
@@ -58,10 +58,10 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     static char desc[32];
-    struct private *m = mod->private;
+    const struct private *m = mod->private;
     snprintf(desc, sizeof(desc), "bat(%s)", m->battery);
     return desc;
 }
diff --git a/modules/clock.c b/modules/clock.c
index 15392aa..0487a9d 100644
--- a/modules/clock.c
+++ b/modules/clock.c
@@ -38,7 +38,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "clock";
 }
diff --git a/modules/cpu.c b/modules/cpu.c
index 4d2c3c8..41ac95f 100644
--- a/modules/cpu.c
+++ b/modules/cpu.c
@@ -48,7 +48,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "cpu";
 }
diff --git a/modules/disk-io.c b/modules/disk-io.c
index ee6da8a..4ce665f 100644
--- a/modules/disk-io.c
+++ b/modules/disk-io.c
@@ -92,7 +92,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "disk-io";
 }
diff --git a/modules/dwl.c b/modules/dwl.c
index 6c8ccff..00b4cb8 100644
--- a/modules/dwl.c
+++ b/modules/dwl.c
@@ -67,7 +67,7 @@ destroy(struct module *module)
 }
 
 static char const *
-description(struct module *module)
+description(const struct module *module)
 {
     return "dwl";
 }
diff --git a/modules/foreign-toplevel.c b/modules/foreign-toplevel.c
index 2997042..d454a39 100644
--- a/modules/foreign-toplevel.c
+++ b/modules/foreign-toplevel.c
@@ -92,7 +92,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "toplevel";
 }
diff --git a/modules/i3.c b/modules/i3.c
index 160913b..f0aa137 100644
--- a/modules/i3.c
+++ b/modules/i3.c
@@ -760,7 +760,7 @@ ws_content_for_name(struct private *m, const char *name)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "i3/sway";
 }
diff --git a/modules/label.c b/modules/label.c
index 01fce76..7e8ee09 100644
--- a/modules/label.c
+++ b/modules/label.c
@@ -22,7 +22,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "label";
 }
diff --git a/modules/mem.c b/modules/mem.c
index d79861e..339501b 100644
--- a/modules/mem.c
+++ b/modules/mem.c
@@ -35,7 +35,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "mem";
 }
diff --git a/modules/mpd.c b/modules/mpd.c
index 05edd7b..604bf88 100644
--- a/modules/mpd.c
+++ b/modules/mpd.c
@@ -86,7 +86,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "mpd";
 }
diff --git a/modules/network.c b/modules/network.c
index 1cb7a2e..17358a6 100644
--- a/modules/network.c
+++ b/modules/network.c
@@ -107,10 +107,10 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     static char desc[32];
-    struct private *m = mod->private;
+    const struct private *m = mod->private;
 
     snprintf(desc, sizeof(desc), "net(%s)", m->iface);
     return desc;
diff --git a/modules/pipewire.c b/modules/pipewire.c
index e369bd2..bfbb15b 100644
--- a/modules/pipewire.c
+++ b/modules/pipewire.c
@@ -818,7 +818,7 @@ destroy(struct module *module)
 }
 
 static char const *
-description(struct module *module)
+description(const struct module *module)
 {
     return "pipewire";
 }
diff --git a/modules/pulse.c b/modules/pulse.c
index c4955ac..9eba3a5 100644
--- a/modules/pulse.c
+++ b/modules/pulse.c
@@ -57,7 +57,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "pulse";
 }
diff --git a/modules/removables.c b/modules/removables.c
index d8fe7c9..4d1d508 100644
--- a/modules/removables.c
+++ b/modules/removables.c
@@ -101,7 +101,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "removables";
 }
diff --git a/modules/river.c b/modules/river.c
index a9dc8b4..059a44e 100644
--- a/modules/river.c
+++ b/modules/river.c
@@ -70,7 +70,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "river";
 }
diff --git a/modules/script.c b/modules/script.c
index fd149d2..1c349a1 100644
--- a/modules/script.c
+++ b/modules/script.c
@@ -60,10 +60,10 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     static char desc[32];
-    struct private *m = mod->private;
+    const struct private *m = mod->private;
 
     char *path = strdup(m->path);
     snprintf(desc, sizeof(desc), "script(%s)", basename(path));
diff --git a/modules/sway-xkb.c b/modules/sway-xkb.c
index 269df24..96d8388 100644
--- a/modules/sway-xkb.c
+++ b/modules/sway-xkb.c
@@ -55,7 +55,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "sway-xkb";
 }
diff --git a/modules/xkb.c b/modules/xkb.c
index 965664d..edd0afe 100644
--- a/modules/xkb.c
+++ b/modules/xkb.c
@@ -73,7 +73,7 @@ destroy(struct module *mod)
 }
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "xkb";
 }
diff --git a/modules/xwindow.c b/modules/xwindow.c
index baf1239..e53114e 100644
--- a/modules/xwindow.c
+++ b/modules/xwindow.c
@@ -39,7 +39,7 @@ struct private {
 };
 
 static const char *
-description(struct module *mod)
+description(const struct module *mod)
 {
     return "xwindow";
 }