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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 84451f989..2ac6a82f1 100644
--- a/lib/pure/streams.nim
+++ b/lib/pure/streams.nim
@@ -1274,7 +1274,7 @@ else: # after 1.3 or JS not defined
 
     new(result)
     result.data = s
-    when defined(gcOrc) or defined(gcArc):
+    when declared(prepareMutation):
       prepareMutation(result.data) # Allows us to mutate using `addr` logic like `copyMem`, otherwise it errors.
     result.pos = 0
     result.closeImpl = ssClose