diff --git a/filesystem/filesystem.c b/filesystem/filesystem.c
index bb9174e0..a43a8f8f 100644
--- a/filesystem/filesystem.c
+++ b/filesystem/filesystem.c
@@ -156,7 +156,7 @@ void stringlistfreecontents( stringlist_t *list )
 	list->strings = NULL;
 }
 
-void stringlistappend( stringlist_t *list, char *text )
+void stringlistappend( stringlist_t *list, const char *text )
 {
 	size_t	textlen;
 
diff --git a/filesystem/filesystem_internal.h b/filesystem/filesystem_internal.h
index fbd8d958..266890e9 100644
--- a/filesystem/filesystem_internal.h
+++ b/filesystem/filesystem_internal.h
@@ -191,7 +191,7 @@ qboolean MD5_HashFile( byte digest[16], const char *pszFileName, uint seed[4] );
 // stringlist ops
 void stringlistinit( stringlist_t *list );
 void stringlistfreecontents( stringlist_t *list );
-void stringlistappend( stringlist_t *list, char *text );
+void stringlistappend( stringlist_t *list, const char *text );
 void stringlistsort( stringlist_t *list );
 void listdirectory( stringlist_t *list, const char *path );