diff --git a/src/control/core.c b/src/control/core.c
index ececd0ea0c72a6d468e8b1b97b509d1eb526f704..42947e9c95408e0e3d437b5d9b8bb0878067cb92 100644
--- a/src/control/core.c
+++ b/src/control/core.c
@@ -187,7 +187,7 @@ void libvlc_release( libvlc_instance_t *p_instance )
 void libvlc_add_intf( libvlc_instance_t *p_i, const char *name,
                       libvlc_exception_t *p_e )
 {
-    if( libvlc_InternalAddIntf( p_i->p_libvlc_int, name ) )
+    if( !libvlc_InternalAddIntf( p_i->p_libvlc_int, name ) )
         RAISEVOID( "Interface initialization failed" );
 }