diff --git a/rpm/devdeps-grpc.spec b/rpm/devdeps-grpc.spec
index 4d9104e..8965531 100644
--- a/rpm/devdeps-grpc.spec
+++ b/rpm/devdeps-grpc.spec
@@ -44,6 +44,8 @@ cd third_party/cares/cares
 # git checkout cares-1_15_0
 mkdir -p cmake/build
 cd cmake/build
+export CFLAGS="-fPIC"
+export CXXFLAGS="-fPIC"
 cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=${RPM_BUILD_ROOT}/%{_prefix} -DCARES_STATIC=ON -DCARES_SHARED=OFF -DCARES_STATIC_PIC=ON ../..
 CPU_CORES=`grep -c ^processor /proc/cpuinfo`
 make -j${CPU_CORES} install