diff --git a/src/math.rs b/src/common/math.rs
similarity index 100%
rename from src/math.rs
rename to src/common/math.rs
diff --git a/src/num_util.rs b/src/common/num_util.rs
similarity index 100%
rename from src/num_util.rs
rename to src/common/num_util.rs
diff --git a/src/lmath.rc b/src/lmath.rc
index 1e84abc..04f0775 100644
--- a/src/lmath.rc
+++ b/src/lmath.rc
@@ -10,12 +10,16 @@
 extern mod std;
 
 pub mod matrix;
-pub mod math;
-pub mod num_util;
 pub mod projection;
 pub mod quaternion;
 pub mod vector;
 
+use common::*;
+pub mod common {
+    pub mod math;
+    pub mod num_util;
+}
+
 #[test]
 pub mod test {
     pub mod test_matrix;