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-rw-r--r--Modules/zlibmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index a15fdb2..7d2f55a 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -53,7 +53,7 @@ typedef struct
} compobject;
static void
-zlib_error(z_stream zst, int err, char *msg)
+zlib_error(z_stream zst, int err, const char *msg)
{
const char *zmsg = Z_NULL;
/* In case of a version mismatch, zst.msg won't be initialized.