diff --git a/src/math/pimathvector.h b/src/math/pimathvector.h
index 3841b7bf..53828e94 100644
--- a/src/math/pimathvector.h
+++ b/src/math/pimathvector.h
@@ -108,7 +108,7 @@ public:
 		return f;}
 
 	template<uint Size1, typename Type1> /// vector {Size, Type} to vector {Size1, Type1}
-	PIMathVectorT<Size1, Type1> turnTo() {PIMathVectorT<Size1, Type1> tv; uint sz = piMin<uint>(Size, Size1); for (uint i = 0; i < sz; ++i) tv[i] = c[i]; return tv;}
+	PIMathVectorT<Size1, Type1> turnTo() const {PIMathVectorT<Size1, Type1> tv; uint sz = piMin<uint>(Size, Size1); for (uint i = 0; i < sz; ++i) tv[i] = c[i]; return tv;}
 
 private:
 	void resize(const Type & new_value = Type()) {for (int i = 0; i < Size; ++i) c[i] = new_value;}
@@ -210,7 +210,7 @@ public:
 		return f;}
 
 	template<typename Type1>
-	PIMathVector turnTo(uint size) {PIMathVector<Type1> tv; uint sz = piMin<uint>(size_, size); for (uint i = 0; i < sz; ++i) tv[i] = c[i]; return tv;}
+	PIMathVector turnTo(uint size) const {PIMathVector<Type1> tv; uint sz = piMin<uint>(size_, size); for (uint i = 0; i < sz; ++i) tv[i] = c[i]; return tv;}
 
 private:
 	uint size_;