diff --git a/anet.spec b/anet.spec
index 2b0829b..e0dcc10 100644
--- a/anet.spec
+++ b/anet.spec
@@ -60,7 +60,8 @@ make doc
 
 
 %install
-%{make_install} prefix=%{_prefix} libdir=%{_libdir} gprdir=%{_GNAT_project_dir}
+# Pass Gnatmake_optflags here too to ensure that Gnatmake won't recompile anything.
+%{make_install} GNATFLAGS='%{Gnatmake_optflags}' prefix=%{_prefix} libdir=%{_libdir} gprdir=%{_GNAT_project_dir}
 
 
 %check