diff --git a/src/CalcManager/Ratpack/logic.cpp b/src/CalcManager/Ratpack/logic.cpp
index 197bda90..2fd36a4d 100644
--- a/src/CalcManager/Ratpack/logic.cpp
+++ b/src/CalcManager/Ratpack/logic.cpp
@@ -169,7 +169,7 @@ void boolnum(PNUMBER* pa, PNUMBER b, int func)
     c->sign = a->sign;
     while (c->cdigit > 1 && *(--pchc) == 0)
     {
-        c->cdigit--;
+        --c->cdigit;
     }
     destroynum(*pa);
     *pa = c;