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-rw-r--r--lib/pure/logging.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/logging.nim b/lib/pure/logging.nim
index 751fc0e8d..43b5ab3ab 100644
--- a/lib/pure/logging.nim
+++ b/lib/pure/logging.nim
@@ -126,7 +126,7 @@ proc substituteLog*(frmt: string, level: Level, args: varargs[string, `$`]): str
       var v = ""
       let app = when defined(js): "" else: getAppFilename()
       while frmt[i] in IdentChars:
-        v.add(toLower(frmt[i]))
+        v.add(toLowerAscii(frmt[i]))
         inc(i)
       case v
       of "date": result.add(getDateStr())