diff --git a/audio/aacgain/Portfile b/audio/aacgain/Portfile
index b77e2db6c7c..09c00bc507d 100644
--- a/audio/aacgain/Portfile
+++ b/audio/aacgain/Portfile
@@ -35,4 +35,7 @@ platform darwin {
     configure.cflags-append -DHAS_LRINTF
 }
 
+compiler.cxx_standard   2003
+configure.cxxflags-append -std=c++03
+
 livecheck.type      none