diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 97389c90f8..4b621e18b6 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -39,7 +39,7 @@ ssl/new_certs_dir:
 
 # Rule for creating private/public key pairs.
 ssl/%.key:
-	openssl genrsa -out $@ 1024
+	openssl genrsa -out $@ 2048
 	chmod 0600 $@
 
 # Root CA certificate