diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84d526393c..2c99d9d417 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -232,6 +232,7 @@ else ()
     ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_LOGICAL_OP -Wlogical-op)
     ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_RANGE_LOOP_ANALYSIS -Wrange-loop-analysis)
     ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_TAUTOLOGICAL_ZERO_COMPARE -Wtautological-unsigned-zero-compare)
+    ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_OLD_STYLE_CAST -Wold-style-cast)
     ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WNO_CLOBBERED -Wno-clobbered)
     # Disabled due to problems compiling OpenSSL on macOS.
     # ADD_CHECK_CXX_COMPILER_FLAG(CMAKE_CXX_FLAGS CXX_WARN_DOCUMENTATION -Wdocumentation)
diff --git a/test/testpaint/CMakeLists.txt b/test/testpaint/CMakeLists.txt
index 75da3b1fec..f76984cd74 100644
--- a/test/testpaint/CMakeLists.txt
+++ b/test/testpaint/CMakeLists.txt
@@ -83,6 +83,7 @@ set_source_files_properties(${CMAKE_CURRENT_LIST_DIR}/addresses.c PROPERTIES COM
 
 add_executable(testpaint EXCLUDE_FROM_ALL ${ORCT2_RIDE_SOURCES} ${ORCT2_RIDE_DEP_SOURCES} ${ORCT2_TESTPAINT_SOURCES} ${RCT2_SECTIONS})
 SET_CHECK_CXX_FLAGS(testpaint)
+target_compile_options(testpaint PRIVATE -Wno-old-style-cast)
 target_include_directories(testpaint PRIVATE "${ROOT_DIR}/src/")
 target_link_libraries(testpaint z)