diff --git a/test/mock/apps/mosquitto_ctrl/CMakeLists.txt b/test/mock/apps/mosquitto_ctrl/CMakeLists.txt
index c041d274b..0ee1cd24d 100644
--- a/test/mock/apps/mosquitto_ctrl/CMakeLists.txt
+++ b/test/mock/apps/mosquitto_ctrl/CMakeLists.txt
@@ -16,5 +16,5 @@ if(WITH_CTRL_SHELL AND EDITLINE_FOUND)
 			${mosquitto_SOURCE_DIR}/test/mock
 			${mosquitto_SOURCE_DIR}/test/mock/apps/mosquitto_ctrl
 	)
-	target_link_libraries(ctrl_shell_mock PRIVATE GTest::gmock)
+	target_link_libraries(ctrl_shell_mock PRIVATE cJSON GTest::gmock)
 endif()
diff --git a/test/mock/lib/CMakeLists.txt b/test/mock/lib/CMakeLists.txt
index 7551e1d65..56e590fc8 100644
--- a/test/mock/lib/CMakeLists.txt
+++ b/test/mock/lib/CMakeLists.txt
@@ -25,4 +25,4 @@ target_include_directories(libmosquitto_mock
         ${mosquitto_SOURCE_DIR}/test/mock
         ${mosquitto_SOURCE_DIR}/test/mock/lib
 )
-target_link_libraries(libmosquitto_mock PRIVATE GTest::gmock)
+target_link_libraries(libmosquitto_mock PRIVATE cJSON GTest::gmock)
diff --git a/test/mock/libcommon/CMakeLists.txt b/test/mock/libcommon/CMakeLists.txt
index 9adba6fec..1a693779d 100644
--- a/test/mock/libcommon/CMakeLists.txt
+++ b/test/mock/libcommon/CMakeLists.txt
@@ -22,4 +22,4 @@ target_include_directories(libmosquitto_common_mock
         ${mosquitto_SOURCE_DIR}/test/mock
         ${mosquitto_SOURCE_DIR}/test/mock/lib
 )
-target_link_libraries(libmosquitto_common_mock PRIVATE GTest::gmock)
+target_link_libraries(libmosquitto_common_mock PRIVATE cJSON GTest::gmock)
diff --git a/test/unit/CMakeLists.txt b/test/unit/CMakeLists.txt
index fe8490a80..d8c4be36d 100644
--- a/test/unit/CMakeLists.txt
+++ b/test/unit/CMakeLists.txt
@@ -13,6 +13,7 @@ target_include_directories(common-unit-test-header
 target_link_libraries(common-unit-test-header
     INTERFACE
         common-options
+        cJSON
         CUnit::CUnit
 )