diff --git a/readconf.c b/readconf.c
index 7f26c680..42be690b 100644
--- a/readconf.c
+++ b/readconf.c
@@ -320,6 +320,7 @@ static struct {
 	{ "securitykeyprovider", oSecurityKeyProvider },
 	{ "knownhostscommand", oKnownHostsCommand },
	{ "requiredrsasize", oRequiredRSASize },
+	{ "rsaminsize", oRequiredRSASize }, /* alias */
 	{ "enableescapecommandline", oEnableEscapeCommandline },
 
 	{ NULL, oBadOption }
diff --git a/servconf.c b/servconf.c
index 29df0463..423772b1 100644
--- a/servconf.c
+++ b/servconf.c
@@ -676,6 +680,7 @@ static struct {
 	{ "casignaturealgorithms", sCASignatureAlgorithms, SSHCFG_ALL },
 	{ "securitykeyprovider", sSecurityKeyProvider, SSHCFG_GLOBAL },
	{ "requiredrsasize", sRequiredRSASize, SSHCFG_ALL },
+	{ "rsaminsize", sRequiredRSASize, SSHCFG_ALL }, /* alias */
 	{ "channeltimeout", sChannelTimeout, SSHCFG_ALL },
 	{ "unusedconnectiontimeout", sUnusedConnectionTimeout, SSHCFG_ALL },
 	{ NULL, sBadOption, 0 }
