1 files changed, 1 insertions, 1 deletions
diff --git a/ruby.c b/ruby.c
index 7682d1e1a..4f6fdaddd 100644
--- a/ruby.c
+++ b/ruby.c
@@ -118,7 +118,7 @@ extern VALUE rb_load_path;
 
 #if defined _WIN32 || defined __CYGWIN__ || defined __DJGPP__
 static char *
-rubylib_mangle(char *s, unsigned int l)
+rubylib_mangle(const char *s, unsigned int l)
 {
     static char *newp, *oldp;
     static int newl, oldl, notfound;