diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index d8778f61f..34d438eaf 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -86,7 +86,8 @@ add_subdirectory( unit-test )
 
 # Add a target for running coverage on tests.
 add_custom_target( coverage
-    COMMAND ${CMAKE_COMMAND} -P ${MODULE_ROOT_DIR}/tools/cmock/coverage.cmake
+    COMMAND ${CMAKE_COMMAND} -DCMOCK_DIR=${CMOCK_DIR}
+    -P ${MODULE_ROOT_DIR}/tools/cmock/coverage.cmake
     DEPENDS cmock unity core_mqtt_utest core_mqtt_serializer_utest core_mqtt_state_utest
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
 )