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-rw-r--r--src/decompress.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/decompress.h b/src/decompress.h
index f10ab88..ee1bf22 100644
--- a/src/decompress.h
+++ b/src/decompress.h
@@ -58,7 +58,7 @@ decompress *decompress_open (const char *filename, int flags);
decompress *decompress_fdopen (int fd);
/* Return true if and only if this is a pipeline-based decompressor. */
-bool decompress_is_pipeline (decompress *d);
+bool decompress_is_pipeline (const decompress *d);
/* Get the pipeline corresponding to a decompressor. Raises an assertion
* failure if this is not a pipeline-based decompressor.