diff --git a/src/dat/nbt.c b/src/dat/nbt.c
index db52bca..e7f5436 100644
--- a/src/dat/nbt.c
+++ b/src/dat/nbt.c
@@ -7,20 +7,6 @@
 #include "../util/compat/endian.h"
 #include "../util/types.h"
 
-int nbt_isprim(u8 tag) {
-	switch (tag) {
-	case NBT_I8:
-	case NBT_I16:
-	case NBT_I32:
-	case NBT_F32:
-	case NBT_I64:
-	case NBT_F64:
-		return 1;
-	default:
-		return 0;
-	}
-}
-
 int nbt_primsize(u8 tag) {
 	switch (tag) {
 	case NBT_I8:  return 1;
diff --git a/src/dat/nbt.h b/src/dat/nbt.h
index 1e76614..5959ced 100644
--- a/src/dat/nbt.h
+++ b/src/dat/nbt.h
@@ -65,10 +65,6 @@ atrb_pure atrb_nonnull(1) static inline u16 nbt_namelen(const u8 *restrict buf)
  * `NULL` is returned if anything went wrong. */
 atrb_pure atrb_nonnull(1) const u8 *nbt_nexttag(const u8 *restrict buf, u16 naml);
 
-/* checks whether the tag is a primitive data tag. (not recommended for filtering tags, use a `switch`)
- * returns a boolean value. */
-atrb_const int nbt_isprim(u8 tag);
-
 /* gets the tag size of primitive types, returns `>0` on success, `<0` on failure */
 atrb_const int nbt_primsize(u8 tag);