diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 470559e17..1a2c6d537 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -129,7 +129,7 @@ proc raiseOSError*(errorCode: OSErrorCode; additionalInfo = "") {.noinline.} =
   if additionalInfo.len == 0:
     e.msg = osErrorMsg(errorCode)
   else:
-    e.msg = additionalInfo & " " & osErrorMsg(errorCode)
+    e.msg = osErrorMsg(errorCode) & "\nAdditional info: " & additionalInfo
   if e.msg == "":
     e.msg = "unknown OS error"
   raise e