Index: modules/javafx.web/src/main/native/Source/WTF/wtf/MemoryPressureHandler.cpp
--- modules/javafx.web/src/main/native/Source/WTF/wtf/MemoryPressureHandler.cpp.orig
+++ modules/javafx.web/src/main/native/Source/WTF/wtf/MemoryPressureHandler.cpp
@@ -68,7 +68,7 @@ static MemoryPressureHandler* memoryPressureHandlerIfE
 }
 
 MemoryPressureHandler::MemoryPressureHandler()
-#if OS(LINUX) || OS(FREEBSD) || OS(HAIKU) || OS(QNX)
+#if OS(LINUX) || OS(FREEBSD) || OS(HAIKU) || OS(QNX) || OS(OPENBSD)
     : m_holdOffTimer(RunLoop::mainSingleton(), "MemoryPressureHandler::HoldOffTimer"_s, this, &MemoryPressureHandler::holdOffTimerFired)
 #elif OS(WINDOWS)
     : m_windowsMeasurementTimer(RunLoop::mainSingleton(), "MemoryPressureHandler::WindowsMeasurementTimer"_s, this, &MemoryPressureHandler::windowsMeasurementTimerFired)
