diff --git a/src/CalcManager/Ratpack/conv.cpp b/src/CalcManager/Ratpack/conv.cpp
index 10f67c17..895159d9 100644
--- a/src/CalcManager/Ratpack/conv.cpp
+++ b/src/CalcManager/Ratpack/conv.cpp
@@ -1091,7 +1091,7 @@ bool stripzeroesnum(_Inout_ PNUMBER pnum, int32_t starting)
     if ( fstrip )
         {
         // Remove them.
-        copy(pmant, pnum->mant.begin(), cdigits);
+        copy(pmant, pmant + cdigits, pnum->mant.begin());
         // And adjust exponent and digit count accordingly.
         pnum->exp += ( pnum->cdigit - cdigits );
         pnum->cdigit = cdigits;
diff --git a/src/CalcManager/Ratpack/num.cpp b/src/CalcManager/Ratpack/num.cpp
index b5424e91..a9f4b10d 100644
--- a/src/CalcManager/Ratpack/num.cpp
+++ b/src/CalcManager/Ratpack/num.cpp
@@ -459,7 +459,7 @@ void _divnum( PNUMBER *pa, PNUMBER b, uint32_t radix, int32_t precision)
 
     if (c->mant.begin() != ++ptrc)
     {
-        copy(ptrc, c->mant.begin(), cdigits);
+        copy(ptrc, ptrc + cdigits, c->mant.begin());
     }
 
     // Cleanup table structure
diff --git a/src/CalcManager/Ratpack/ratpak.h b/src/CalcManager/Ratpack/ratpak.h
index 53c6a479..bd959a9c 100644
--- a/src/CalcManager/Ratpack/ratpak.h
+++ b/src/CalcManager/Ratpack/ratpak.h
@@ -211,7 +211,7 @@ _destroynum(x),(x)=nullptr
         int32_t trim = (x)->cdigit - precision-g_ratio;\
             if ( trim > 1 ) \
                 { \
-std::copy((x)->mant.begin() + trim, (x)->mant.begin(), (x)->cdigit-trim);\
+std::copy((x)->mant.begin() + trim, (x)->mant.begin() + (x)->cdigit, (x)->mant.begin());\
                 (x)->cdigit -= trim; \
                 (x)->exp += trim; \
                 } \
@@ -221,7 +221,7 @@ std::copy((x)->mant.begin() + trim, (x)->mant.begin(), (x)->cdigit-trim);\
         int32_t trim = (x)->pp->cdigit - (precision/g_ratio) - 2;\
             if ( trim > 1 ) \
                 { \
-std::copy((x)->pp->mant.begin() + trim, (x)->pp->mant.begin(), ((x)->pp->cdigit-trim)); \
+std::copy((x)->pp->mant.begin() + trim, (x)->pp->mant.begin() + (x)->pp->cdigit, (x)->pp->mant.begin()); \
                 (x)->pp->cdigit -= trim; \
                 (x)->pp->exp += trim; \
                 } \
diff --git a/src/CalcManager/Ratpack/support.cpp b/src/CalcManager/Ratpack/support.cpp
index c87f206a..70c8deec 100644
--- a/src/CalcManager/Ratpack/support.cpp
+++ b/src/CalcManager/Ratpack/support.cpp
@@ -695,7 +695,7 @@ void trimit( PRAT *px, int32_t precision)
                 }
             else
                 {
-                copy(pp->mant.begin() + (trim-pp->exp), pp->mant.begin(), pp->cdigit-trim+pp->exp);
+                copy(pp->mant.begin() + (trim-pp->exp), pp->mant.begin() + pp->cdigit, pp->mant.begin());
                 pp->cdigit -= trim-pp->exp;
                 pp->exp = 0;
                 }
@@ -706,7 +706,7 @@ void trimit( PRAT *px, int32_t precision)
                 }
             else
                 {
-                copy(pq->mant.begin() + (trim-pq->exp), pq->mant.begin(), pq->cdigit-trim+pq->exp);
+                copy(pq->mant.begin() + (trim-pq->exp), pq->mant.begin() + pq->cdigit, pq->mant.begin());
                 pq->cdigit -= trim-pq->exp;
                 pq->exp = 0;
                 }