diff --git a/compiler/semexprs.nim b/compiler/semexprs.nim
index 6638848df8..34a9cd1dd8 100644
--- a/compiler/semexprs.nim
+++ b/compiler/semexprs.nim
@@ -306,7 +306,7 @@ proc semLowHigh(c: PContext, n: PNode, m: TMagic): PNode =
     var typ = skipTypes(n.sons[1].typ, abstractVarRange +
                                        {tyTypeDesc, tyFieldAccessor})
     case typ.kind
-    of tySequence, tyString, tyOpenArray, tyVarargs: 
+    of tySequence, tyString, tyCString, tyOpenArray, tyVarargs: 
       n.typ = getSysType(tyInt)
     of tyArrayConstr, tyArray: 
       n.typ = typ.sons[0] # indextype
diff --git a/compiler/semfold.nim b/compiler/semfold.nim
index 1988c512e6..a3f1b1c130 100644
--- a/compiler/semfold.nim
+++ b/compiler/semfold.nim
@@ -665,8 +665,8 @@ proc getConstExpr(m: PSym, n: PNode): PNode =
       of mLow: 
         result = newIntNodeT(firstOrd(n.sons[1].typ), n)
       of mHigh: 
-        if  skipTypes(n.sons[1].typ, abstractVar).kind notin
-            {tyOpenArray, tyVarargs, tySequence, tyString}:
+        if skipTypes(n.sons[1].typ, abstractVar).kind notin
+            {tySequence, tyString, tyCString, tyOpenArray, tyVarargs}:
           result = newIntNodeT(lastOrd(skipTypes(n[1].typ, abstractVar)), n)
         else:
           var a = getArrayConstr(m, n.sons[1])
diff --git a/tests/exprs/thighCString.nim b/tests/exprs/thighCString.nim
new file mode 100644
index 0000000000..543966df46
--- /dev/null
+++ b/tests/exprs/thighCString.nim
@@ -0,0 +1,6 @@
+discard """
+  output: "5"
+"""
+let test = cstring("foobar")
+
+echo high(test)