diff --git a/gfx/shader/shader_gl_cg.c b/gfx/shader/shader_gl_cg.c
index c8b7fc36c2..4047114f55 100644
--- a/gfx/shader/shader_gl_cg.c
+++ b/gfx/shader/shader_gl_cg.c
@@ -508,6 +508,7 @@ static bool load_program(
       if (*(cg->cg_alias_define[i]))
          argv[argc++] = cg->cg_alias_define[i];
    }
+   argv[argc] = NULL;
 
    if (path_is_file)
    {