diff --git a/lib/data.c b/lib/data.c
index d194eaab..a2b39164 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -17,7 +17,7 @@ pic_data_p(pic_state *pic, pic_value obj, const pic_data_type *type)
 }
 
 void *
-pic_data(pic_state *PIC_UNUSED(pic), pic_value data)
+pic_data(pic_state *pic, pic_value data)
 {
   return data_ptr(pic, data)->data;
 }
diff --git a/lib/dict.c b/lib/dict.c
index f7765e77..2c20f3af 100644
--- a/lib/dict.c
+++ b/lib/dict.c
@@ -43,7 +43,7 @@ pic_dict_set(pic_state *pic, pic_value dict, pic_value key, pic_value val)
 }
 
 int
-pic_dict_size(pic_state *PIC_UNUSED(pic), pic_value dict)
+pic_dict_size(pic_state *pic, pic_value dict)
 {
   return kh_size(&dict_ptr(pic, dict)->hash);
 }
@@ -70,7 +70,7 @@ pic_dict_del(pic_state *pic, pic_value dict, pic_value key)
 }
 
 bool
-pic_dict_next(pic_state *PIC_UNUSED(pic), pic_value dict, int *iter, pic_value *key, pic_value *val)
+pic_dict_next(pic_state *pic, pic_value dict, int *iter, pic_value *key, pic_value *val)
 {
   khash_t(dict) *h = &dict_ptr(pic, dict)->hash;
   int it = *iter;
diff --git a/lib/object.h b/lib/object.h
index dc00abc7..a800c3dc 100644
--- a/lib/object.h
+++ b/lib/object.h
@@ -190,11 +190,11 @@ obj_value(pic_state *pic, void *ptr)
   return pic_obj_value(pic, ptr, obj_type(ptr));
 }
 
-#define DEFPTR(name,type)                               \
-  PIC_STATIC_INLINE type *                              \
-  name##_ptr(pic_state *PIC_UNUSED(pic), pic_value o) { \
-    assert(pic_##name##_p(pic,o));                      \
-    return (type *) pic_ptr(pic, o);                    \
+#define DEFPTR(name,type)                       \
+  PIC_STATIC_INLINE type *                      \
+  name##_ptr(pic_state *pic, pic_value o) {     \
+    assert(pic_##name##_p(pic,o));              \
+    return (type *) pic_ptr(pic, o);            \
   }
 
 #define pic_data_p(pic,o) (pic_data_p(pic,o,NULL))
diff --git a/lib/string.c b/lib/string.c
index 596aac97..24531ae1 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -250,7 +250,7 @@ pic_vstrf_value(pic_state *pic, const char *fmt, va_list ap)
 }
 
 int
-pic_str_len(pic_state *PIC_UNUSED(pic), pic_value str)
+pic_str_len(pic_state *pic, pic_value str)
 {
   return str_ptr(pic, str)->rope->weight;
 }
diff --git a/lib/vector.c b/lib/vector.c
index 3fed5856..5073f7d0 100644
--- a/lib/vector.c
+++ b/lib/vector.c
@@ -26,19 +26,19 @@ pic_make_vec(pic_state *pic, int len, pic_value *argv)
 }
 
 pic_value
-pic_vec_ref(pic_state *PIC_UNUSED(pic), pic_value vec, int k)
+pic_vec_ref(pic_state *pic, pic_value vec, int k)
 {
   return vec_ptr(pic, vec)->data[k];
 }
 
 void
-pic_vec_set(pic_state *PIC_UNUSED(pic), pic_value vec, int k, pic_value val)
+pic_vec_set(pic_state *pic, pic_value vec, int k, pic_value val)
 {
   vec_ptr(pic, vec)->data[k] = val;
 }
 
 int
-pic_vec_len(pic_state *PIC_UNUSED(pic), pic_value vec)
+pic_vec_len(pic_state *pic, pic_value vec)
 {
   return vec_ptr(pic, vec)->len;
 }