diff --git a/tools/Makefile b/tools/Makefile
index 55fd34cb9..566e5cba3 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,7 +1,7 @@
 .PHONY: all clean
 
 CC := gcc
-CFLAGS := -O3 -std=c17 -Wall -Wextra -pedantic -Wno-missing-field-initializers
+CFLAGS := -O3 -std=c11 -Wall -Wextra -pedantic -Wno-missing-field-initializers
 
 tools := \
 	lzcomp \
@@ -19,7 +19,7 @@ clean:
 
 gfx: common.h
 
-lzcomp: CFLAGS = -O3 -flto -std=c17 -Wall -Wextra -pedantic -Wno-strict-overflow -Wno-sign-compare
+lzcomp: CFLAGS = -O3 -flto -std=c11 -Wall -Wextra -pedantic -Wno-strict-overflow -Wno-sign-compare
 lzcomp: $(wildcard lz/*.c) $(wildcard lz/*.h)
 	$(CC) $(CFLAGS) -o $@ lz/*.c