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-rw-r--r--lib/pure/streams.nim2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pure/streams.nim b/lib/pure/streams.nim
index 77f384a79..dc00271a5 100644
--- a/lib/pure/streams.nim
+++ b/lib/pure/streams.nim
@@ -242,7 +242,7 @@ proc readDataStr*(s: Stream, buffer: var string, slice: Slice[int]): int =
     result = s.readDataStrImpl(s, buffer, slice)
   else:
     # fallback
-    result = s.readData(addr buffer[0], buffer.len)
+    result = s.readData(addr buffer[slice.a], slice.b + 1 - slice.a)
 
 template jsOrVmBlock(caseJsOrVm, caseElse: untyped): untyped =
   when nimvm: