diff --git a/src/camera.cpp b/src/camera.cpp
index 4dd8180..50aecb9 100644
--- a/src/camera.cpp
+++ b/src/camera.cpp
@@ -10,6 +10,7 @@
 using glm::ivec2;
 using glm::vec2;
 using glm::vec3;
+using glm::vec4;
 using glm::mat4;