diff --git a/tests/build_debug.sh b/tests/build_debug.sh
index c69af43c..fe650b8e 100755
--- a/tests/build_debug.sh
+++ b/tests/build_debug.sh
@@ -1,6 +1,6 @@
 cd
 mkdir -p build/netgen
 cd build/netgen
-cmake ../../src/netgen -DUSE_CCACHE=ON -DBUILD_TYPE=DEBUG -DENABLE_UNIT_TESTS=ON
+cmake ../../src/netgen -DUSE_CCACHE=ON -DBUILD_TYPE=DEBUG -DENABLE_UNIT_TESTS=ON -DUSE_OCC=ON
 make -j12
 make install