diff -U2 -r /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd/HTTP.cpp /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd/HTTP.cpp
--- /var/lib/copr-rpmbuild/results/i2pd-git/upstream-unpacked/Source0/i2pd-openssl/libi2pd/HTTP.cpp	2026-10-06 01:20:22.000000000 +0000
+++ /var/lib/copr-rpmbuild/results/i2pd-git/srpm-unpacked/i2pd-openssl.tar.gz-extract/i2pd-openssl/libi2pd/HTTP.cpp	2026-10-06 01:04:15.000000000 +0000
@@ -161,10 +161,12 @@
 					? url.substr(pos_p, std::string::npos)
 					: url.substr(pos_p, pos_c - pos_p);
-
+				/* stoi throws exception on failure, we don't need it */
 				port = 0;
-				auto res = std::from_chars (port_str.data(), port_str.data() + port_str.size(), port);
-				if (res.ec != std::errc())
-					return false;
-
+				for (char c : port_str) {
+					if (c < '0' || c > '9')
+						return false;
+					port *= 10;
+					port += c - '0';
+				}
 				if (pos_c == std::string::npos)
 					return true; /* no path part */