diff --git a/src/Makefile b/src/Makefile
index ba3f77c5..103024bb 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -17,7 +17,7 @@ ifeq (, $(shell which $(CPREFIX)windres))
 	CCWINDRES = windres
 endif
 
-CFLAGS = -std=c99 -pie -fPIE -pipe -I$(WINDIVERTHEADERS) -L$(WINDIVERTLIBS) \
+CFLAGS = -std=c2x -pie -fPIE -pipe -I$(WINDIVERTHEADERS) -L$(WINDIVERTLIBS) \
          -O3 -march=x86-64-v3 -D_FORTIFY_SOURCE=2 -fstack-protector \
          -Wall -Wextra -Wpedantic -Wformat=2 -Wformat-overflow=2 -Wformat-truncation=2 \
          -Wformat-security -Wno-format-nonliteral -Wshadow -Wstrict-aliasing=1 \