diff --git a/src/main/module.h b/src/main/module.h
index 1dc8c034..fe89608f 100644
--- a/src/main/module.h
+++ b/src/main/module.h
@@ -13,7 +13,7 @@ extern "C" {
 struct module {
 	/* The name of the module. It needs to be unique in its class (ie. in
 	 * the scope of root modules or submodules of one parent module). */
-	char *name;
+	const char *name;
 
 	/* The options that should be registered for this module.
 	 * The table should end with NULL_OPTION_INFO. */
diff --git a/src/mime/backend/common.c b/src/mime/backend/common.c
index eeceb596..9407622f 100644
--- a/src/mime/backend/common.c
+++ b/src/mime/backend/common.c
@@ -106,7 +106,7 @@ get_next_path_filename(char **path_ptr, unsigned char separator)
 
 struct mime_handler *
 init_mime_handler(char *program, char *description,
-		  char *backend_name, int ask, int block)
+		  const char *backend_name, int ask, int block)
 {
 	int programlen = strlen(program);
 	struct mime_handler *handler;
diff --git a/src/mime/backend/common.h b/src/mime/backend/common.h
index c3e29576..49dba5cb 100644
--- a/src/mime/backend/common.h
+++ b/src/mime/backend/common.h
@@ -31,7 +31,7 @@ get_next_path_filename(char **path_ptr, unsigned char separator);
 
 struct mime_handler *
 init_mime_handler(char *program, char *description,
-		  char *backend_name, int ask, int block);
+		  const char *backend_name, int ask, int block);
 
 #ifdef __cplusplus
 }
diff --git a/src/mime/mime.h b/src/mime/mime.h
index 452c5ee2..2f042a58 100644
--- a/src/mime/mime.h
+++ b/src/mime/mime.h
@@ -12,7 +12,7 @@ struct uri;
 
 struct mime_handler {
 	char *description;
-	char *backend_name;
+	const char *backend_name;
 	unsigned int ask:1;
 	unsigned int block:1;
 	unsigned int copiousoutput:1;