diff --git a/lib/Makefile b/lib/Makefile
index ff0a913a..c09353c4 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -39,9 +39,10 @@ LIBPICRIN_HEADERS = \
 
 CFLAGS += -I./include -Wall -Wextra -g
 
-mini-picrin: libpicrin.so ext/main.o
-	$(CC) $(CFLAGS) -o $@ libpicrin.so ext/main.o
+mini-picrin: $(LIBPICRIN_OBJS) ext/main.o
+	$(CC) $(CFLAGS) -o $@ ext/main.o $(LIBPICRIN_OBJS)
 
+libpicrin.so: CFLAGS += -fPIC
 libpicrin.so: $(LIBPICRIN_OBJS)
 	$(CC) $(CFLAGS) -shared -o $@ $(LIBPICRIN_OBJS) $(LDFLAGS)
 
@@ -52,6 +53,6 @@ libpicrin.so.minimal: $(LIBPICRIN_SRCS)
 $(LIBPICRIN_OBJS): $(LIBPICRIN_HEADERS)
 
 clean:
-	$(RM) $(LIBPICRIN_OBJS) libpicrin.so libpicrin.so.minimal
+	$(RM) $(LIBPICRIN_OBJS) ext/main.o mini-picrin libpicrin.so libpicrin.so.minimal
 
 .PHONY: clean
diff --git a/lib/port.c b/lib/port.c
index 997cb814..7d11fdd4 100644
--- a/lib/port.c
+++ b/lib/port.c
@@ -361,8 +361,8 @@ pic_vfprintf(pic_state *pic, pic_value port, const char *fmt, va_list ap)
         unsigned long vp = (unsigned long) va_arg(ap, void*);
         char buf[sizeof vp * CHAR_BIT / 4 + 1];
         size_t i;
-        for (i = 0; i < sizeof buf; ++i) {
-          buf[sizeof buf - i - 1] = digits[vp % 16];
+        for (i = 0; i < sizeof buf - 1; ++i) {
+          buf[sizeof buf - i - 2] = digits[vp % 16];
           vp /= 16;
         }
         buf[i] = '\0';