diff --git a/cruft/util/matrix.hpp b/cruft/util/matrix.hpp
index 3bee6ce0..e600085d 100644
--- a/cruft/util/matrix.hpp
+++ b/cruft/util/matrix.hpp
@@ -209,10 +209,10 @@ namespace cruft {
 
 
     // Perspective matrices
-    template <typename T> matrix<4,4,T> ortho (T left, T right, T bottom, T top, T near, T far);
-    template <typename T> matrix<4,4,T> ortho2D (T left, T right, T bottom, T top);
-    template <typename T> matrix<4,4,T> perspective (T fov, T aspect, range<T> Z);
-    template <typename T> matrix<4,4,T> look_at (point<3,T> eye, point<3,T> target, vector<3,T> up);
+    template <typename T = f32> matrix<4,4,T> ortho (T left, T right, T bottom, T top, T near, T far);
+    template <typename T = f32> matrix<4,4,T> ortho2D (T left, T right, T bottom, T top);
+    template <typename T = f32> matrix<4,4,T> perspective (T fov, T aspect, range<T> Z);
+    template <typename T = f32> matrix<4,4,T> look_at (point<3,T> eye, point<3,T> target, vector<3,T> up);
 
     // Affine matrices
     template <size_t S, typename T>