diff --git a/include/llvm/ADT/APSInt.h b/include/llvm/ADT/APSInt.h
index 7e7d1c398f2..1c9931c30fe 100644
--- a/include/llvm/ADT/APSInt.h
+++ b/include/llvm/ADT/APSInt.h
@@ -150,7 +150,7 @@ public:
     return *this;
   }
   APSInt& operator--() {
-    static_cast<APInt&>(*this)++;
+    static_cast<APInt&>(*this)--;
     return *this;
   }
   APSInt operator++(int) {