1 files changed, 1 insertions, 1 deletions
diff --git a/any_sexp.h b/any_sexp.h
index ee7c1e7..c8a394d 100644
--- a/any_sexp.h
+++ b/any_sexp.h
@@ -335,7 +335,7 @@ any_sexp_t any_sexp_read(any_sexp_reader_t *reader)
 
         buffer[length] = '\0';
 
-        if (number) {
+        if (number && !(length == 1 && buffer[0] == '-')) {
             intptr_t value = strtol(buffer, NULL, 10);
             return any_sexp_number(value);
         }