diff --git a/sis8300llrf.Makefile b/sis8300llrf.Makefile
index b353f7f821f5f5d04fbbaa9c4445ebd37bcc0de9..b82311815250ccad83194701b7f09442957bb3b4 100644
--- a/sis8300llrf.Makefile
+++ b/sis8300llrf.Makefile
@@ -54,7 +54,7 @@ endif
 
 # print cc1plus: warning: unrecognized command line option ‘-Wno-format-truncation’ with lower gcc 7
 USR_CFLAGS   += -Wno-format-truncation
-USR_CPPFLAGS += -Wno-format-truncation
+USR_CPPFLAGS += -Wno-format-truncation -std=c++11