diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7bf2dd6282198e4ebdfa07e4a3e77dc8b8616676..362e73431501386733fab77bcc8f8984532b4bd5 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -68,9 +68,11 @@ test:centos7.3:
              -DZLIB_INCLUDE_DIR=$EBROOTZLIB/include
              -DTIFF_INCLUDE_DIR=$EBROOTLIBTIFF/include
              -DTIFF_LIBRARY=$EBROOTLIBTIFF/lib/libtiff.so
+             -DZLIB_INCLUDE_DIR=$EBROOTZLIB/include
+             -DZLIB_LIBRARY=$EBROOTZLIB/lib/libz.so
              -DOPTIMIZE=1
-             -DCMAKE_C_FLAGS='-Wno-unused-local-typedefs -L/scicore/soft/apps/libpng/1.6.34-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/LibTIFF/4.0.9-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/zlib/1.2.11-GCCcore-7.3.0/lib' 
-             -DCMAKE_CXX_FLAGS='-Wno-unused-local-typedefs -L/scicore/soft/apps/libpng/1.6.34-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/LibTIFF/4.0.9-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/zlib/1.2.11-GCCcore-7.3.0/lib' 
+             -DCMAKE_C_FLAGS='-Wno-unused-local-typedefs -L/scicore/soft/apps/libpng/1.6.34-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/LibTIFF/4.0.9-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/zlib/1.2.11-GCCcore-7.3.0/lib/ -isystem ${EBROOTBOOST}/include -isystem ${EBROOTOPENMM}/include'
+             -DCMAKE_CXX_FLAGS='-Wno-unused-local-typedefs -L/scicore/soft/apps/libpng/1.6.34-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/LibTIFF/4.0.9-GCCcore-7.3.0/lib/ -L/scicore/soft/apps/zlib/1.2.11-GCCcore-7.3.0/lib/ -isystem ${EBROOTBOOST}/include -isystem ${EBROOTOPENMM}/include' 
              -DCMAKE_EXE_LINKER_FLAGS=" -pthread"
   - make -j 2
   - echo "    ... done building OST."