diff --git a/Makefile b/Makefile
index db9cf208..c18fd434 100644
--- a/Makefile
+++ b/Makefile
@@ -67,7 +67,7 @@ test: test-contribs test-nostdlib
 test-contribs: bin/picrin $(CONTRIB_TESTS)
 
 test-nostdlib:
-	$(CC) -I extlib/benz/include -D'PIC_ENABLE_LIBC=0' -D'PIC_ENABLE_FLOAT=0' -D'PIC_ENABLE_STDIO=0' -nostdlib -fPIC -shared -std=c89 -pedantic -Wall -Wextra -Werror -o lib/libbenz.so $(BENZ_SRCS) etc/libc_polyfill.c -fno-stack-protector
+	$(CC) -I extlib/benz/include -D'PIC_ENABLE_LIBC=0' -D'PIC_ENABLE_FLOAT=0' -D'PIC_ENABLE_STDIO=0' -ffreestanding -nostdlib -fPIC -shared -std=c89 -pedantic -Wall -Wextra -Werror -o lib/libbenz.so $(BENZ_SRCS) etc/libc_polyfill.c -fno-stack-protector
 	rm -f lib/libbenz.so
 
 install: all
diff --git a/extlib/benz/error.c b/extlib/benz/error.c
index c50fc85d..b75223d8 100644
--- a/extlib/benz/error.c
+++ b/extlib/benz/error.c
@@ -7,7 +7,7 @@
 void
 pic_panic(pic_state PIC_UNUSED(*pic), const char *msg)
 {
-  extern void abort();
+  extern PIC_NORETURN void abort();
 
 #if DEBUG
   fprintf(stderr, "abort: %s\n", msg);