diff --git a/examples/cairo-pdf-rendering/CMakeLists.txt b/examples/cairo-pdf-rendering/CMakeLists.txt
index 87ad43b..49cde3b 100644
--- a/examples/cairo-pdf-rendering/CMakeLists.txt
+++ b/examples/cairo-pdf-rendering/CMakeLists.txt
@@ -13,8 +13,8 @@ target_compile_options(clay_examples_cairo_pdf_rendering PUBLIC)
 target_include_directories(clay_examples_cairo_pdf_rendering PUBLIC . ${CAIRO_INCLUDE_DIRS})
 
 target_link_libraries(clay_examples_cairo_pdf_rendering PUBLIC Cairo::Cairo)
-set(CMAKE_C_FLAGS_DEBUG "-Wall -Werror")
-set(CMAKE_C_FLAGS_RELEASE "-O3")
+set(CMAKE_CXX_FLAGS_DEBUG "-Wall -Werror")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 
 add_custom_command(
         TARGET clay_examples_cairo_pdf_rendering POST_BUILD