diff --git a/shared.gpr.in b/shared.gpr.in
index ba14efeb..a4748844 100644
--- a/shared.gpr.in
+++ b/shared.gpr.in
@@ -60,12 +60,12 @@ project Shared is
              for Switches ("Ada") use
                 ("-gnat05", "-gnatQ", "-gnatwae", "-gnatay", "-g", "-O0",
                  "-Werror=format-security");
-             for Switches ("C") use ("-g", "-O0");
+             for Switches ("C") use ("-g", "-O0", "-fPIC");
          when "Production" =>
              for Switches ("Ada") use
                 ("-gnat05", "-gnatQ", "-O2", "-gnatn", "-gnatwa", "-gnaty",
                  "-Werror=format-security");
-             for Switches ("C") use ("-O2");
+             for Switches ("C") use ("-O2", "-fPIC");
       end case;
 
       for Switches ("C") use Compiler'Switches ("C") & Gtk_Include;