diff --git a/tree.go b/tree.go
index 3444209..4eb6475 100644
--- a/tree.go
+++ b/tree.go
@@ -418,7 +418,7 @@ func (operation *Operation) Solution () (solution int64, err error) {
 	return
 }
 
-func (operation *Operation) InexactSolution (solution float64, err error) {
+func (operation *Operation) InexactSolution () (solution float64, err error) {
 	var intSolution int64
 	intSolution, err = operation.Solution()
 	solution = float64(intSolution)
@@ -529,3 +529,8 @@ func (literal *IntegerLiteral) Solution () (solution int64, err error) {
 	solution = literal.value
 	return
 }
+
+func (literal *IntegerLiteral) InexactSolution () (solution float64, err error) {
+	solution = float64(literal.value)
+	return
+}