diff --git a/delay/tests/Makefile b/delay/tests/Makefile
index 9a918b0..0405b76 100644
--- a/delay/tests/Makefile
+++ b/delay/tests/Makefile
@@ -9,7 +9,7 @@ NAME := test_dsp_ringbuffer
 CONFIG ?= debug
 TARGET ?= $(NAME)
 
-CXXFLAGS += -std=c++11
+CXXFLAGS += -std=c++20
 
 INCLUDES += -I $(realpath .) -I $(realpath ../../)