diff --git a/compiler/jsgen.nim b/compiler/jsgen.nim
index 312d2d8ccc..72fe4ecc59 100644
--- a/compiler/jsgen.nim
+++ b/compiler/jsgen.nim
@@ -1352,7 +1352,7 @@ proc genMagic(p: PProc, n: PNode, r: var TCompRes) =
   of mEcho: genEcho(p, n, r)
   of mSlurp, mStaticExec:
     localError(n.info, errXMustBeCompileTime, n.sons[0].sym.name.s)
-  of mCopyStr: binaryExpr(p, n, r, "", "($1.slice($2,-1))")
+  of mCopyStr: binaryExpr(p, n, r, "", "($1.slice($2))")
   of mCopyStrLast: ternaryExpr(p, n, r, "", "($1.slice($2, ($3)+1).concat(0))")
   of mNewString: unaryExpr(p, n, r, "mnewString", "mnewString($1)")
   of mNewStringOfCap: unaryExpr(p, n, r, "mnewString", "mnewString(0)")