diff --git a/poincare/src/integer.cpp b/poincare/src/integer.cpp
index 54c4e2db3..7baaafaa1 100644
--- a/poincare/src/integer.cpp
+++ b/poincare/src/integer.cpp
@@ -581,7 +581,7 @@ Integer Integer::addition(const Integer & a, const Integer & b, bool inverseBNeg
       us.setNegative(a.sign() == ExpressionNode::Sign::Negative);
       return us;
     } else {
-      Integer us = IntegerNode::usum(a.node(), b.node(), true);
+      Integer us = IntegerNode::usum(b.node(), a.node(), true);
       us.setNegative(bNegative);
       return us;
     }
diff --git a/poincare/test/integer.cpp b/poincare/test/integer.cpp
index 7db97d8d1..a665084e0 100644
--- a/poincare/test/integer.cpp
+++ b/poincare/test/integer.cpp
@@ -87,36 +87,38 @@ QUIZ_CASE(poincare_integer_addition) {
   assert_add_to(Integer("65537"), Integer("65537"), Integer("131074"));
 }
 
+static inline void assert_sub_to(const Integer i, const Integer j, const Integer k) {
+  assert(Integer::NaturalOrder(Integer::Subtraction(i, j), k) == 0);
+}
+
 QUIZ_CASE(poincare_integer_subtraction) {
-#if 0
-  assert(Integer::Subtraction(Integer(123), Integer(23)).isEqualTo(Integer(100)));
-  assert(Integer::Subtraction(Integer("123456789123456789"), Integer("9999999999")).isEqualTo(Integer("123456779123456790")));
-  assert(Integer::Subtraction(Integer(23), Integer(100)).isEqualTo(Integer(-77)));
-  assert(Integer::Subtraction(Integer(23), Integer(23)).isEqualTo(Integer(0)));
-  assert(Integer::Subtraction(Integer(-23), Integer(-23)).isEqualTo(Integer(0)));
-  assert(Integer::Subtraction(Integer("-123456789123456789"), Integer("-123456789123456789")).isEqualTo(Integer(0)));
-  assert(Integer::Subtraction(Integer("123456789123456789"), Integer("123456789123456789")).isEqualTo(Integer(0)));
-  assert(Integer::Subtraction(Integer("18446744073709551616"), Integer("18446744073709551368")).isEqualTo(Integer(248)));
+  assert_sub_to(Integer(123), Integer(23), Integer(100));
+  assert_sub_to(Integer("123456789123456789"), Integer("9999999999"), Integer("123456779123456790"));
+  assert_sub_to(Integer(23), Integer(100), Integer(-77));
+  assert_sub_to(Integer(23), Integer(23), Integer(0));
+  assert_sub_to(Integer(-23), Integer(-23), Integer(0));
+  assert_sub_to(Integer("-123456789123456789"), Integer("-123456789123456789"), Integer(0));
+  assert_sub_to(Integer("123456789123456789"), Integer("123456789123456789"), Integer(0));
+  assert_sub_to(Integer("18446744073709551616"), Integer("18446744073709551368"), Integer(248));
 
   //2^64-2^64
-  assert(Integer::Subtraction(Integer("18446744073709551616"), Integer("18446744073709551616")).isEqualTo(Integer("0")));
+  assert_sub_to(Integer("18446744073709551616"), Integer("18446744073709551616"), Integer("0"));
   //2^64-2^32
-  assert(Integer::Subtraction(Integer("18446744073709551616"), Integer("4294967296")).isEqualTo(Integer("18446744069414584320")));
+  assert_sub_to(Integer("18446744073709551616"), Integer("4294967296"), Integer("18446744069414584320"));
   //2^32-2^64
-  assert(Integer::Subtraction(Integer("4294967296"), Integer("18446744073709551616")).isEqualTo(Integer("-18446744069414584320")));
+  assert_sub_to(Integer("4294967296"), Integer("18446744073709551616"), Integer("-18446744069414584320"));
   //2^64-1
-  assert(Integer::Subtraction(Integer("18446744073709551616"), Integer("1")).isEqualTo(Integer("18446744073709551615")));
+  assert_sub_to(Integer("18446744073709551616"), Integer("1"), Integer("18446744073709551615"));
   //1-2^64
-  assert(Integer::Subtraction(Integer("1"), Integer("18446744073709551616")).isEqualTo(Integer("-18446744073709551615")));
+  assert_sub_to(Integer("1"), Integer("18446744073709551616"), Integer("-18446744073709551615"));
   //2^32-2^32
-  assert(Integer::Subtraction(Integer("4294967296"), Integer("4294967296")).isEqualTo(Integer("0")));
+  assert_sub_to(Integer("4294967296"), Integer("4294967296"), Integer("0"));
   //2^32-1
-  assert(Integer::Subtraction(Integer("4294967296"), Integer("1")).isEqualTo(Integer("4294967295")));
+  assert_sub_to(Integer("4294967296"), Integer("1"), Integer("4294967295"));
   //2^16-1
-  assert(Integer::Subtraction(Integer("65537"), Integer("1")).isEqualTo(Integer("65536")));
+  assert_sub_to(Integer("65537"), Integer("1"), Integer("65536"));
   //2^16-2^16
-  assert(Integer::Subtraction(Integer("65537"), Integer("65537")).isEqualTo(Integer("0")));
-#endif
+  assert_sub_to(Integer("65537"), Integer("65537"), Integer("0"));
 }
 
 QUIZ_CASE(poincare_integer_multiplication) {