diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 79f9950a7..82ccd9051 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -1259,12 +1259,12 @@ proc findExe*(exe: string, followSymlinks: bool = true;
           while followSymlinks: # doubles as if here
             if x.symlinkExists:
               var r = newString(maxSymlinkLen)
-              var len = readlink(x, r, maxSymlinkLen)
+              var len = readlink(x.cstring, r.cstring, maxSymlinkLen)
               if len < 0:
                 raiseOSError(osLastError(), exe)
               if len > maxSymlinkLen:
                 r = newString(len+1)
-                len = readlink(x, r, len)
+                len = readlink(x.cstring, r.cstring, len)
               setLen(r, len)
               if isAbsolute(r):
                 x = r
@@ -1404,8 +1404,8 @@ when not defined(nimscript):
       var bufsize = 1024 # should be enough
       result = newString(bufsize)
       while true:
-        if getcwd(result, bufsize) != nil:
-          setLen(result, c_strlen(result))
+        if getcwd(result.cstring, bufsize) != nil:
+          setLen(result, c_strlen(result.cstring))
           break
         else:
           let err = osLastError()
@@ -1774,12 +1774,12 @@ proc expandSymlink*(symlinkPath: string): string {.noWeirdTarget.} =
     result = symlinkPath
   else:
     result = newString(maxSymlinkLen)
-    var len = readlink(symlinkPath, result, maxSymlinkLen)
+    var len = readlink(symlinkPath, result.cstring, maxSymlinkLen)
     if len < 0:
       raiseOSError(osLastError(), symlinkPath)
     if len > maxSymlinkLen:
       result = newString(len+1)
-      len = readlink(symlinkPath, result, len)
+      len = readlink(symlinkPath, result.cstring, len)
     setLen(result, len)
 
 const hasCCopyfile = defined(osx) and not defined(nimLegacyCopyFile)
@@ -2344,7 +2344,7 @@ iterator walkDir*(dir: string; relative = false, checkDir = false):
             var k = pcFile
 
             template kSetGeneric() =  # pure Posix component `k` resolution
-              if lstat(path, s) < 0'i32: continue  # don't yield
+              if lstat(path.cstring, s) < 0'i32: continue  # don't yield
               elif S_ISDIR(s.st_mode):
                 k = pcDir
               elif S_ISLNK(s.st_mode):
@@ -3041,10 +3041,10 @@ when not weirdTarget and (defined(freebsd) or defined(dragonfly) or defined(netb
 when not weirdTarget and (defined(linux) or defined(solaris) or defined(bsd) or defined(aix)):
   proc getApplAux(procPath: string): string =
     result = newString(maxSymlinkLen)
-    var len = readlink(procPath, result, maxSymlinkLen)
+    var len = readlink(procPath, result.cstring, maxSymlinkLen)
     if len > maxSymlinkLen:
       result = newString(len+1)
-      len = readlink(procPath, result, len)
+      len = readlink(procPath, result.cstring, len)
     setLen(result, len)
 
 when not weirdTarget and defined(openbsd):
@@ -3169,7 +3169,7 @@ proc getAppFilename*(): string {.rtl, extern: "nos$1", tags: [ReadIOEffect], noW
     var size = cuint32(0)
     getExecPath1(nil, size)
     result = newString(int(size))
-    if getExecPath2(result, size):
+    if getExecPath2(result.cstring, size):
       result = "" # error!
     if result.len > 0:
       result = result.expandFilename