diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 7915488e4..50cf945ea 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -132,6 +132,11 @@ if(BUILD_OVERLUNKY)
                 endif()
         endif()
 
+        # Disable error on Clang16
+        if(CLANG)
+                target_compile_options(libwavpack PRIVATE "-Wno-implicit-function-declaration")
+        endif()
+
         # --------------------------------------------------
         # toml11
         option(toml11_BUILD_TEST OFF)
diff --git a/src/game_api/math.hpp b/src/game_api/math.hpp
index 2daa1fd5d..4775d07d2 100644
--- a/src/game_api/math.hpp
+++ b/src/game_api/math.hpp
@@ -99,6 +99,7 @@ struct Vec2
         operator--();
         return old;
     }
+    Vec2& operator=(const Vec2& a) = default;
     bool operator==(const Vec2& a) const
     {
         return x == a.x && y == a.y;
@@ -217,6 +218,7 @@ struct AABB
         new_aabb.offset(-a.x, -a.y);
         return new_aabb;
     }
+    AABB& operator=(const AABB& a) = default;
     /// Compute area of the AABB, can be zero if one dimension is zero or negative if one dimension is inverted.
     float area() const
     {
@@ -303,6 +305,7 @@ struct Triangle
         new_triangle.offset(-a);
         return new_triangle;
     }
+    Triangle& operator=(const Triangle& a) = default;
     /// Rotate triangle by an angle, the px/py are just coordinates, not offset from the center
     Triangle& rotate(float angle, float px, float py)
     {
@@ -440,6 +443,7 @@ struct Quad
         new_quad.offset(-a.x, -a.y);
         return new_quad;
     }
+    Quad& operator=(const Quad& a) = default;
     bool is_null() const
     {
         return bottom_left_x == 0 && bottom_left_y == 0 && bottom_right_x == 0 && bottom_right_y == 0 /**/