diff --git a/Sources/SWBCSupport/IndexStore.h b/Sources/SWBCSupport/IndexStore.h
index 7d4b77b8..c1546932 100644
--- a/Sources/SWBCSupport/IndexStore.h
+++ b/Sources/SWBCSupport/IndexStore.h
@@ -181,14 +181,10 @@ typedef struct {
   indexstore_string_ref_t
   (*unit_dependency_get_name)(indexstore_unit_dependency_t);
 
-  bool
-  (*unit_reader_dependencies_apply)(indexstore_unit_reader_t,
-                                  bool(^applier)(indexstore_unit_dependency_t));
-
   bool
   (*unit_reader_dependencies_apply_f)(indexstore_unit_reader_t,
                                               void *context,
                       bool(*applier)(void *context, indexstore_unit_dependency_t));
-} indexstore_functions_t;
+} swiftbuild_indexstore_functions_t;
 
 #endif
diff --git a/Sources/SWBUtil/IndexStore.swift b/Sources/SWBUtil/IndexStore.swift
index 46cbd8bc..8b4515fc 100644
--- a/Sources/SWBUtil/IndexStore.swift
+++ b/Sources/SWBUtil/IndexStore.swift
@@ -334,7 +334,7 @@ private final class IndexStoreAPIImpl {
     private let dylib: LibraryHandle
 
     /// The index store API functions.
-    fileprivate let fn: indexstore_functions_t
+    fileprivate let fn: swiftbuild_indexstore_functions_t
 
     fileprivate func call<T>(_ fn: (inout indexstore_error_t?) -> T) throws -> T {
         var error: indexstore_error_t? = nil
@@ -354,7 +354,7 @@ private final class IndexStoreAPIImpl {
         self.path = path
         self.dylib = try Library.open(path)
 
-        var api = indexstore_functions_t()
+        var api = swiftbuild_indexstore_functions_t()
         api.store_create = Library.lookup(dylib, "indexstore_store_create")
         api.store_get_unit_name_from_output_path = Library.lookup(dylib,  "indexstore_store_get_unit_name_from_output_path")
         api.unit_reader_create = Library.lookup(dylib,  "indexstore_unit_reader_create")