diff --git a/src/Makefile b/src/Makefile
index 531b03d1..2cdae086 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -26,7 +26,7 @@ FTN = mpifort
 CLOCK_ID = CLOCK_MONOTONIC
 
 # C++ compiler flags 
-CCFLAGS = -fpic -O2 -std=c++17 -DCLOCK_ID=$(CLOCK_ID)
+CCFLAGS = -fpic -O2 -std=c++20 -DCLOCK_ID=$(CLOCK_ID)
 FFLAGS= -fpic -O2
 
 LDFLAGS = -lstdc++