diff --git a/dmidecode.spec b/dmidecode.spec
index 0e71fc4..980a789 100644
--- a/dmidecode.spec
+++ b/dmidecode.spec
@@ -26,7 +26,7 @@ I/O ports (e.g. serial, parallel, USB).
 %patch0 -p1 -b .system-family
 
 %build
-make %{?_smp_mflags} CFLAGS="$RPM_OPT_FLAGS"
+make %{?_smp_mflags} CFLAGS="%{optflags}"
 
 %install
 make %{?_smp_mflags} DESTDIR=%{buildroot} prefix=%{_prefix} install-bin install-man