diff --git a/lua-luadbi.spec b/lua-luadbi.spec
index 1e2bc42..73cae38 100644
--- a/lua-luadbi.spec
+++ b/lua-luadbi.spec
@@ -52,8 +52,11 @@ Oracle.
 %setup -q -n luadbi-%{version}
 %patch0 -p1
 
+sed -i \
+    -e :-g -pedantic -Wall -O2:%{optflags} -fPIC -I%{lua_incdir}:g \
+    Makefile
+
 %build
-export CFLAGS="%{optflags} -fPIC"
 make %{?_smp_mflags} LIBDIR=%{_libdir}
 
 %install