diff --git a/src/nostalgia/core/glfw/core.hpp b/src/nostalgia/core/glfw/core.hpp
index 6e66793a..6a238aaa 100644
--- a/src/nostalgia/core/glfw/core.hpp
+++ b/src/nostalgia/core/glfw/core.hpp
@@ -14,7 +14,7 @@ struct GlfwImplData {
 	UpdateHandler eventHandler = nullptr;
 	KeyEventHandler keyEventHandler = nullptr;
 	uint64_t wakeupTime = 0;
-	uint64_t keysDown;
+	uint64_t keysDown = 0;
 };
 
 }