diff --git a/lhttp_parser/Makefile b/lhttp_parser/Makefile
index 7967910..167f10e 100644
--- a/lhttp_parser/Makefile
+++ b/lhttp_parser/Makefile
@@ -14,7 +14,7 @@ endif
 all: lhttp_parser.so lhttp_parser.a
 
 http-parser/http_parser.o:
-	CPPFLAGS=-fPIC $(MAKE) -C http-parser http_parser.o
+	CPPFLAGS=-fPIC $(MAKE) -C http-parser http_parser.o -Werror=implicit-fallthrough=0
 
 lhttp_parser.o: lhttp_parser.c
 	$(CC) -c $< -o $@ ${CFLAGS}
diff --git a/lhttp_parser/http-parser/Makefile b/lhttp_parser/http-parser/Makefile
index 64e5c2f..8ae8c86 100644
--- a/lhttp_parser/http-parser/Makefile
+++ b/lhttp_parser/http-parser/Makefile
@@ -7,7 +7,7 @@ CPPFLAGS_DEBUG += $(CPPFLAGS_DEBUG_EXTRA)
 CPPFLAGS_FAST = $(CPPFLAGS) -DHTTP_PARSER_STRICT=0
 CPPFLAGS_FAST += $(CPPFLAGS_FAST_EXTRA)
 
-CFLAGS += -Wall -Wextra -Werror
+CFLAGS += -Wall -Wextra -Werror -Wimplicit-fallthrough=0 
 CFLAGS_DEBUG = $(CFLAGS) -O0 -g $(CFLAGS_DEBUG_EXTRA)
 CFLAGS_FAST = $(CFLAGS) -O3 $(CFLAGS_FAST_EXTRA)
 CFLAGS_LIB = $(CFLAGS_FAST) -fPIC