diff --git a/alloc.c b/alloc.c
index 27f697e4c8..2886aa9354 100644
--- a/alloc.c
+++ b/alloc.c
@@ -8,7 +8,7 @@
  * up with maximal alignment because it doesn't know what the object alignment
  * for the new allocation is.
  */
-#include "cache.h"
+#include "git-compat-util.h"
 #include "object.h"
 #include "blob.h"
 #include "tree.h"
diff --git a/blame.h b/blame.h
index 38bde535b3..b60d1d81e3 100644
--- a/blame.h
+++ b/blame.h
@@ -1,7 +1,6 @@
 #ifndef BLAME_H
 #define BLAME_H
 
-#include "cache.h"
 #include "commit.h"
 #include "xdiff-interface.h"
 #include "revision.h"
diff --git a/blob.c b/blob.c
index 8f83523b0c..888e28a559 100644
--- a/blob.c
+++ b/blob.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "blob.h"
 #include "repository.h"
 #include "alloc.h"
diff --git a/cache-tree.h b/cache-tree.h
index bd97caa07b..faae88be63 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -1,7 +1,6 @@
 #ifndef CACHE_TREE_H
 #define CACHE_TREE_H
 
-#include "cache.h"
 #include "tree.h"
 #include "tree-walk.h"
 
diff --git a/cache.h b/cache.h
index 4e0d9bccc0..d0e105ec58 100644
--- a/cache.h
+++ b/cache.h
@@ -14,6 +14,7 @@
 #include "pack-revindex.h"
 #include "hash.h"
 #include "path.h"
+#include "object.h"
 #include "oid-array.h"
 #include "repository.h"
 #include "mem-pool.h"
@@ -453,26 +454,6 @@ void prefetch_cache_entries(const struct index_state *istate,
 extern struct index_state the_index;
 #endif
 
-#define TYPE_BITS 3
-
-/*
- * Values in this enum (except those outside the 3 bit range) are part
- * of pack file format. See gitformat-pack(5) for more information.
- */
-enum object_type {
-	OBJ_BAD = -1,
-	OBJ_NONE = 0,
-	OBJ_COMMIT = 1,
-	OBJ_TREE = 2,
-	OBJ_BLOB = 3,
-	OBJ_TAG = 4,
-	/* 5 for future expansion */
-	OBJ_OFS_DELTA = 6,
-	OBJ_REF_DELTA = 7,
-	OBJ_ANY,
-	OBJ_MAX
-};
-
 static inline enum object_type object_type(unsigned int mode)
 {
 	return S_ISDIR(mode) ? OBJ_TREE :
diff --git a/diff-merges.c b/diff-merges.c
index faa7bc73a3..ec97616db1 100644
--- a/diff-merges.c
+++ b/diff-merges.c
@@ -1,6 +1,7 @@
 #include "git-compat-util.h"
 #include "diff-merges.h"
 
+#include "gettext.h"
 #include "revision.h"
 
 typedef void (*diff_merges_setup_func_t)(struct rev_info *);
diff --git a/diff.h b/diff.h
index 41eb2c3d42..b90036f529 100644
--- a/diff.h
+++ b/diff.h
@@ -8,6 +8,7 @@
 #include "pathspec.h"
 #include "object.h"
 #include "oidset.h"
+#include "strbuf.h"
 
 /**
  * The diff API is for programs that compare two sets of files (e.g. two trees,
@@ -71,7 +72,6 @@ struct oid_array;
 struct option;
 struct repository;
 struct rev_info;
-struct strbuf;
 struct userdiff_driver;
 
 typedef int (*pathchange_fn_t)(struct diff_options *options,
diff --git a/diffcore-delta.c b/diffcore-delta.c
index 18d8f766d7..c30b56e983 100644
--- a/diffcore-delta.c
+++ b/diffcore-delta.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "diff.h"
 #include "diffcore.h"
 
diff --git a/fsck.h b/fsck.h
index 668330880e..e17730e9da 100644
--- a/fsck.h
+++ b/fsck.h
@@ -1,6 +1,7 @@
 #ifndef GIT_FSCK_H
 #define GIT_FSCK_H
 
+#include "object.h"
 #include "oidset.h"
 
 enum fsck_msg_type {
diff --git a/help.c b/help.c
index 5f84a50b94..216777d2bf 100644
--- a/help.c
+++ b/help.c
@@ -5,6 +5,7 @@
 #include "exec-cmd.h"
 #include "run-command.h"
 #include "levenshtein.h"
+#include "gettext.h"
 #include "help.h"
 #include "command-list.h"
 #include "string-list.h"
diff --git a/list-objects-filter-options.h b/list-objects-filter-options.h
index 1fe393f447..ef03b45132 100644
--- a/list-objects-filter-options.h
+++ b/list-objects-filter-options.h
@@ -1,9 +1,10 @@
 #ifndef LIST_OBJECTS_FILTER_OPTIONS_H
 #define LIST_OBJECTS_FILTER_OPTIONS_H
 
-#include "cache.h"
+#include "object.h"
 #include "parse-options.h"
 #include "string-list.h"
+#include "strbuf.h"
 
 /*
  * The list of defined filters for list-objects.
diff --git a/negotiator/noop.c b/negotiator/noop.c
index 60569b8350..7b72937686 100644
--- a/negotiator/noop.c
+++ b/negotiator/noop.c
@@ -1,4 +1,4 @@
-#include "cache.h"
+#include "git-compat-util.h"
 #include "noop.h"
 #include "../commit.h"
 #include "../fetch-negotiator.h"
diff --git a/object.h b/object.h
index 31ebe11458..fc45b158da 100644
--- a/object.h
+++ b/object.h
@@ -1,7 +1,7 @@
 #ifndef OBJECT_H
 #define OBJECT_H
 
-#include "cache.h"
+#include "hash.h"
 
 struct buffer_slab;
 
@@ -81,6 +81,26 @@ struct object_array {
  */
 #define FLAG_BITS  28
 
+#define TYPE_BITS 3
+
+/*
+ * Values in this enum (except those outside the 3 bit range) are part
+ * of pack file format. See gitformat-pack(5) for more information.
+ */
+enum object_type {
+	OBJ_BAD = -1,
+	OBJ_NONE = 0,
+	OBJ_COMMIT = 1,
+	OBJ_TREE = 2,
+	OBJ_BLOB = 3,
+	OBJ_TAG = 4,
+	/* 5 for future expansion */
+	OBJ_OFS_DELTA = 6,
+	OBJ_REF_DELTA = 7,
+	OBJ_ANY,
+	OBJ_MAX
+};
+
 /*
  * The object type is stored in 3 bits.
  */
diff --git a/shallow.h b/shallow.h
index aba6ff5829..e9ca7e4bc8 100644
--- a/shallow.h
+++ b/shallow.h
@@ -6,6 +6,8 @@
 #include "repository.h"
 #include "strbuf.h"
 
+struct oid_array;
+
 void set_alternate_shallow_file(struct repository *r, const char *path, int override);
 int register_shallow(struct repository *r, const struct object_id *oid);
 int unregister_shallow(const struct object_id *oid);
diff --git a/t/helper/test-bloom.c b/t/helper/test-bloom.c
index 787fd52455..127f134a2a 100644
--- a/t/helper/test-bloom.c
+++ b/t/helper/test-bloom.c
@@ -1,4 +1,4 @@
-#include "git-compat-util.h"
+#include "cache.h"
 #include "bloom.h"
 #include "hex.h"
 #include "test-tool.h"
diff --git a/t/helper/test-example-decorate.c b/t/helper/test-example-decorate.c
index b9d1200eb9..7c7fc8efc1 100644
--- a/t/helper/test-example-decorate.c
+++ b/t/helper/test-example-decorate.c
@@ -1,5 +1,5 @@
 #include "test-tool.h"
-#include "cache.h"
+#include "git-compat-util.h"
 #include "object.h"
 #include "decorate.h"
 
diff --git a/worktree.h b/worktree.h
index 9dcea6fc8c..2baeca2a8a 100644
--- a/worktree.h
+++ b/worktree.h
@@ -1,7 +1,6 @@
 #ifndef WORKTREE_H
 #define WORKTREE_H
 
-#include "cache.h"
 #include "refs.h"
 
 struct strbuf;