diff --git a/src/linalg.cc b/src/linalg.cc
index b0ea2b4b..2f368f9a 100644
--- a/src/linalg.cc
+++ b/src/linalg.cc
@@ -26,7 +26,7 @@ BoundingBox operator*(const Transform3d &m, const BoundingBox &box)
 	return newbox;
 }
 
-bool matrix_contains_infinity( const Eigen::Transform3d &m )
+bool matrix_contains_infinity( const Transform3d &m )
 {
   for (int i=0;i<m.matrix().rows();i++) {
     for (int j=0;j<m.matrix().cols();j++) {
@@ -36,7 +36,7 @@ bool matrix_contains_infinity( const Eigen::Transform3d &m )
 	return false;
 }
 
-bool matrix_contains_nan( const Eigen::Transform3d &m )
+bool matrix_contains_nan( const Transform3d &m )
 {
   for (int i=0;i<m.matrix().rows();i++) {
     for (int j=0;j<m.matrix().cols();j++) {
diff --git a/src/linalg.h b/src/linalg.h
index 450e5939..48960b77 100644
--- a/src/linalg.h
+++ b/src/linalg.h
@@ -18,8 +18,8 @@ using Eigen::Matrix4d;
 using Eigen::Transform3d;
 #endif
 
-bool matrix_contains_infinity( const Eigen::Transform3d &m );
-bool matrix_contains_nan( const Eigen::Transform3d &m );
+bool matrix_contains_infinity( const Transform3d &m );
+bool matrix_contains_nan( const Transform3d &m );
 
 BoundingBox operator*(const Transform3d &m, const BoundingBox &box);