diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae82613c4..173af2df0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -324,7 +324,7 @@ if (OPM_ENABLE_PYTHON)
   # testing.
   add_test(NAME python_tests
            WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/python
-           COMMAND ${PYTHON_EXECUTABLE} setup.py build_ext --dry-run --build-lib ${PROJECT_BINARY_DIR}/python/python/opm test
+           COMMAND ${CMAKE_COMMAND} -E env LD_LIBRARY_PATH=${PROJECT_BINARY_DIR}/lib ${PYTHON_EXECUTABLE} setup.py build_ext --dry-run --build-lib ${PROJECT_BINARY_DIR}/python/python/opm test
            )
 
   set_target_properties(opmcommon PROPERTIES POSITION_INDEPENDENT_CODE ON)