diff --git a/girara/config.c b/girara/config.c
index 6e48e7fcd857f5fbb231f58caae25719a01ba601..40ccf3a00c202474a8e0cf68300ea8232059c5ea 100644
--- a/girara/config.c
+++ b/girara/config.c
@@ -19,7 +19,7 @@
 
 static void
 cb_window_icon(girara_session_t* session, const char* UNUSED(name),
-    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
+    girara_setting_type_t UNUSED(type), const void* value, void* UNUSED(data))
 {
   g_return_if_fail(session != NULL && value != NULL);
 
@@ -32,7 +32,7 @@ cb_window_icon(girara_session_t* session, const char* UNUSED(name),
 
 static void
 cb_font(girara_session_t* session, const char* UNUSED(name),
-    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
+    girara_setting_type_t UNUSED(type), const void* value, void* UNUSED(data))
 {
   g_return_if_fail(session != NULL && value != NULL);
 
@@ -41,7 +41,7 @@ cb_font(girara_session_t* session, const char* UNUSED(name),
 
 static void
 cb_color(girara_session_t* session, const char* name,
-    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
+    girara_setting_type_t UNUSED(type), const void* value, void* UNUSED(data))
 {
   g_return_if_fail(session != NULL && value != NULL);
 
@@ -57,7 +57,7 @@ cb_color(girara_session_t* session, const char* name,
 
 static void
 cb_guioptions(girara_session_t* session, const char* UNUSED(name),
-    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
+    girara_setting_type_t UNUSED(type), const void* value, void* UNUSED(data))
 {
   g_return_if_fail(session != NULL && value != NULL);
 
@@ -68,7 +68,7 @@ cb_guioptions(girara_session_t* session, const char* UNUSED(name),
   bool show_vscrollbar  = false;
 
   /* evaluate input */
-  char* input               = (char*) value;
+  const char* input         = value;
   const size_t input_length = strlen(input);
 
   for (size_t i = 0; i < input_length; i++) {
@@ -113,11 +113,11 @@ cb_guioptions(girara_session_t* session, const char* UNUSED(name),
 
 static void
 cb_scrollbars(girara_session_t* session, const char* name,
-    girara_setting_type_t UNUSED(type), void* value, void* UNUSED(data))
+    girara_setting_type_t UNUSED(type), const void* value, void* UNUSED(data))
 {
   g_return_if_fail(session != NULL && value != NULL);
 
-  const bool val = *(bool*) value;
+  const bool val = *(const bool*) value;
 
   char* guioptions = NULL;
   girara_setting_get(session, "guioptions", &guioptions);
diff --git a/girara/settings.c b/girara/settings.c
index c1447a08c6109317e33ad325a3a97df44084274f..3fc4938aa737c2816b97ba2a2386ee66d008f75d 100644
--- a/girara/settings.c
+++ b/girara/settings.c
@@ -36,19 +36,19 @@ struct girara_setting_s
 };
 
 void
-girara_setting_set_value(girara_session_t* session, girara_setting_t* setting, void* value)
+girara_setting_set_value(girara_session_t* session, girara_setting_t* setting, const void* value)
 {
   g_return_if_fail(setting && (value || setting->type == STRING));
 
   switch(setting->type) {
     case BOOLEAN:
-      setting->value.b = *((bool *) value);
+      setting->value.b = *((const bool *) value);
       break;
     case FLOAT:
-      setting->value.f = *((float *) value);
+      setting->value.f = *((const float *) value);
       break;
     case INT:
-      setting->value.i = *((int *) value);
+      setting->value.i = *((const int *) value);
       break;
     case STRING:
       if (setting->value.s != NULL) {
@@ -97,7 +97,7 @@ girara_setting_add(girara_session_t* session, const char* name, void* value, gir
 }
 
 bool
-girara_setting_set(girara_session_t* session, const char* name, void* value)
+girara_setting_set(girara_session_t* session, const char* name, const void* value)
 {
   g_return_val_if_fail(session != NULL, false);
   g_return_val_if_fail(name != NULL, false);
diff --git a/girara/settings.h b/girara/settings.h
index ad407d58add8fed8bb6057a4a090e3e8d6845be5..010efb86015fda8c6cb748d8c6735fb1c291c8e6 100644
--- a/girara/settings.h
+++ b/girara/settings.h
@@ -33,7 +33,7 @@ bool girara_setting_add(girara_session_t* session, const char* name,
  * @return TRUE No error occurred
  * @return FALSE An error occurred
  */
-bool girara_setting_set(girara_session_t* session, const char* name, void* value) GIRARA_VISIBLE;
+bool girara_setting_set(girara_session_t* session, const char* name, const void* value) GIRARA_VISIBLE;
 
 /**
  * Retrieve the value of a setting. If the setting is a string, the value stored
@@ -89,6 +89,6 @@ girara_setting_type_t girara_setting_get_type(girara_setting_t* setting) GIRARA_
  * @param value The new value
  */
 void girara_setting_set_value(girara_session_t* session,
-    girara_setting_t* setting, void* value) GIRARA_VISIBLE;
+    girara_setting_t* setting, const void* value) GIRARA_VISIBLE;
 
 #endif
diff --git a/girara/types.h b/girara/types.h
index 3703e07a346adc7a6e75d829648c4ba4308717ad..cbae887802e68b1875e5d527d54d4ffb5f46d8a1 100644
--- a/girara/types.h
+++ b/girara/types.h
@@ -144,7 +144,7 @@ typedef enum girara_setting_type_e
  * @param data User data
  */
 typedef void (*girara_setting_callback_t)(girara_session_t* session,
-    const char* name, girara_setting_type_t type, void* value, void* data);
+    const char* name, girara_setting_type_t type, const void* value, void* data);
 
 /**
  * Definition of an argument of a shortcut or buffered command
diff --git a/tests/test_setting.c b/tests/test_setting.c
index a6699ffd9bd50e35c3659f50365ee75b6d87abc8..fcccbccd52c19128175c090b95c05d02e3080ab9 100644
--- a/tests/test_setting.c
+++ b/tests/test_setting.c
@@ -45,7 +45,7 @@ START_TEST(test_settings_basic) {
 static int callback_called = 0;
 
 static void
-setting_callback(girara_session_t* session, const char* name, girara_setting_type_t type, void* value, void* data)
+setting_callback(girara_session_t* session, const char* name, girara_setting_type_t type, const void* value, void* data)
 {
   fail_unless(callback_called == 0, NULL);
   fail_unless(session != NULL, NULL);