diff --git a/include/Range.h b/include/Range.h
index 09f7ffc..8f8834e 100644
--- a/include/Range.h
+++ b/include/Range.h
@@ -10,6 +10,7 @@ public:
 
   inline Range16 operator-(Range16 a);
   inline Range16 operator+(Range16 a);
+  inline Range16 operator-();
 
   inline bool operator==(Range16 a);
   inline bool operator!=(Range16 a);
diff --git a/src/Range.cpp b/src/Range.cpp
index 340f165..3e3661e 100644
--- a/src/Range.cpp
+++ b/src/Range.cpp
@@ -26,10 +26,11 @@ Range16::Range16(short s) {
 }
 
 Range16 Range16::operator-(Range16 a) { this->range - a.range; };
-
 Range16 Range16::operator+(Range16 a) { this->range + a.range; };
 
-bool Range16::operator==(Range16 a) { return (this->range == a.range); }
+Range16 Range16::operator-() { -this->range; }
+
+bool Range16::operator==(Range16 a) { this->range == a.range; }
 bool Range16::operator!=(Range16 a) { return (this->range != a.range); }
 
 bool Range16::operator<(Range16 a) { return (this->range < a.range); }