fix:
diff --git a/libguile/read.c b/libguile/read.c
index d91c868..5f9ce36 100644
--- a/libguile/read.c
+++ b/libguile/read.c
@@ -1437,7 +1437,7 @@ scm_scan_for_encoding (SCM port)
/* grab the next token */
i = 0;
while (pos + i - header <= SCM_ENCODING_SEARCH_SIZE
- && (isalnum(pos[i]) || pos[i] == '_' || pos[i] == '-' || pos[i] ==
'.'))
+ && (isalnum((int) pos[i]) || pos[i] == '_' || pos[i] == '-' || pos[i]
== '.'))
i++;
if (i == 0)
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