diff --git a/src/common/algebra.hpp b/src/common/algebra.hpp
index 334d8c4..382145f 100644
--- a/src/common/algebra.hpp
+++ b/src/common/algebra.hpp
@@ -399,7 +399,7 @@ namespace KTools {
 	}
 
 	template<typename T>
-	inline void inverseOf(const ProjectiveMatrix<2, T>& M) {
+	inline ProjectiveMatrix<2, T> inverseOf(const ProjectiveMatrix<2, T>& M) {
 		ProjectiveMatrix<2, T> N(M);
 		invert(N);
 		return N;