diff --git a/configure.in b/configure.in
index 24febf5b3..374e1b739 100644
--- a/configure.in
+++ b/configure.in
@@ -762,8 +762,8 @@ ADD_PLUGIN([eap-radius],           [c libcharon])
 ADD_PLUGIN([eap-tls],              [c libcharon])
 ADD_PLUGIN([eap-ttls],             [c libcharon])
 ADD_PLUGIN([eap-tnc],              [c libcharon])
-ADD_PLUGIN([tnc_imc],              [c libcharon])
-ADD_PLUGIN([tnc_imv],              [c libcharon])
+ADD_PLUGIN([tnc-imc],              [c libcharon])
+ADD_PLUGIN([tnc-imv],              [c libcharon])
 ADD_PLUGIN([tnccs-11],             [c libcharon])
 ADD_PLUGIN([tnccs-20],             [c libcharon])
 ADD_PLUGIN([medsrv],               [c libcharon])