diff --git a/tests/cefclient/CMakeLists.txt.in b/tests/cefclient/CMakeLists.txt.in
index 8a9924e85..5feb782d2 100644
--- a/tests/cefclient/CMakeLists.txt.in
+++ b/tests/cefclient/CMakeLists.txt.in
@@ -135,6 +135,9 @@ if(OS_LINUX)
   set_target_properties(${CEF_TARGET} PROPERTIES BUILD_WITH_INSTALL_RPATH TRUE)
   set_target_properties(${CEF_TARGET} PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CEF_TARGET_OUT_DIR})
 
+  # We don't call deprecated GTK functions, and they can cause build failures, so disable them.
+  add_definitions("-DGTK_DISABLE_DEPRECATED")
+
   # Copy CEF binary and resource files to the target output directory.
   COPY_FILES("${CEF_TARGET}" "${CEF_BINARY_FILES}" "${CEF_BINARY_DIR}" "${CEF_TARGET_OUT_DIR}")
   COPY_FILES("${CEF_TARGET}" "${CEF_RESOURCE_FILES}" "${CEF_RESOURCE_DIR}" "${CEF_TARGET_OUT_DIR}")