diff --git a/admin/autoupdater/src/manifest.c b/admin/autoupdater/src/manifest.c
index dbad89e..16fcdc6 100644
--- a/admin/autoupdater/src/manifest.c
+++ b/admin/autoupdater/src/manifest.c
@@ -89,6 +89,11 @@ void parse_line(char *line, struct manifest *m, const char *branch, const char *
 		}
 		m->n_signatures++;
 		m->signatures = realloc(m->signatures, m->n_signatures * sizeof(ecdsa_signature_t *));
+		if (!m->signatures) {
+			fprintf(stderr, "autoupdater: error: failed to extend signature list\n");
+			abort();
+		}
+
 		m->signatures[m->n_signatures - 1] = sig;
 	} else if (strcmp(line, "---") == 0) {
 		m->sep_found = true;