diff --git a/src/Makefile b/src/Makefile
index 10da40dc..d8833bf7 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -19,7 +19,6 @@ C_TARGETS := \
 	nbdsetsize \
 	openclose \
 	sg/dxfer-from-dev \
-	sg/syzkaller1 \
 	zbdioctl
 
 C_URING_TARGETS := metadata \
@@ -32,7 +31,10 @@ HAVE_UBLK_HEADER := $(call HAVE_C_HEADER,linux/ublk_cmd.h,1)
 CXX_TARGETS := \
 	discontiguous-io
 
-TARGETS := $(C_TARGETS) $(CXX_TARGETS)
+SYZKALLER_TARGETS := \
+	sg/syzkaller1
+
+TARGETS := $(C_TARGETS) $(CXX_TARGETS) $(SYZKALLER_TARGETS)
 
 ifeq ($(HAVE_UBLK_HEADER), 1)
 C_URING_TARGETS += $(C_UBLK_TARGETS)
@@ -70,6 +72,9 @@ $(C_TARGETS): %: %.c
 $(CXX_TARGETS): %: %.cpp
 	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) -o $@ $^
 
+$(SYZKALLER_TARGETS): %: %.c
+	$(CC) $(CFLAGS) -Wno-unused-but-set-variable $(LDFLAGS) -o $@ $^
+
 $(C_URING_TARGETS): %: %.c
 	$(CC) $(CFLAGS) $(LDFLAGS) $(URING_FLAGS) -o $@ $^ $(URING_LIBS)
 
diff --git a/src/metadata.c b/src/metadata.c
index d935fd63..556f3690 100644
--- a/src/metadata.c
+++ b/src/metadata.c
@@ -246,7 +246,7 @@ static int check_metadata(void *p, int intervals, int ref)
 
 				if (v != ref) {
 					fprintf(stderr, "reftag interval:%d expected:%x got:%llx\n",
-						i, ref, v);
+						i, ref, (unsigned long long)v);
 					return -1;
 				}
 				remaining -= sizeof(*tuple);