diff --git a/ffi/java/MclTest.java b/ffi/java/MclTest.java
index c47966d..8438e84 100644
--- a/ffi/java/MclTest.java
+++ b/ffi/java/MclTest.java
@@ -107,6 +107,10 @@ public class MclTest {
 			Mcl.mul(cP, P, c); // cP = P * c
 			Mcl.pairing(e1, cP, Q);
 			assertBool("e1 == e2", e1.equals(e2));
+			Mcl.inv(e1, e1);
+			Mcl.mul(e1, e1, e2);
+			e2.setStr("1 0 0 0 0 0 0 0 0 0 0 0");
+			assertBool("e1 == 1", e1.equals(e2));
 
 			BLSsignature(Q);
 			if (errN == 0) {
diff --git a/ffi/java/mcl_impl.hpp b/ffi/java/mcl_impl.hpp
index bc3bd9f..668910d 100644
--- a/ffi/java/mcl_impl.hpp
+++ b/ffi/java/mcl_impl.hpp
@@ -370,7 +370,7 @@ void mul(GT& z, const GT& x, const GT& y)
 }
 void inv(GT& y, GT& x)
 {
-	mcl::bn::Fp12::inv(y.self_, x.self_);
+	mcl::bn::Fp12::unitaryInv(y.self_, x.self_);
 }
 void pow(GT& z, const GT& x, const Fr& y)
 {