diff --git a/package/zlib/1.2.11/clang/install.sh b/package/zlib/1.2.11/clang/install.sh
index 8cad2b328afdc6295233feb6f21b42b07f0cac56..39c232ffcccb340aec5a1edf8e28f46a0a86dc1c 100755
--- a/package/zlib/1.2.11/clang/install.sh
+++ b/package/zlib/1.2.11/clang/install.sh
@@ -7,6 +7,6 @@ cd ${JARVIS_TMP}
 rm -rf zlib-${zlib_ver}
 tar -xvf ${JARVIS_DOWNLOAD}/zlib-${zlib_ver}.tar.gz
 cd zlib-${zlib_ver}
-./configure --prefix=$1 FCFLAGS="-O3 -fPIC"
+./configure --prefix=$1
 make -j
 make install