diff --git a/Sources/IndexStoreDB/SymbolRole.swift b/Sources/IndexStoreDB/SymbolRole.swift
index cde8a26..9c28032 100644
--- a/Sources/IndexStoreDB/SymbolRole.swift
+++ b/Sources/IndexStoreDB/SymbolRole.swift
@@ -42,9 +42,7 @@ public struct SymbolRole: OptionSet, Hashable, Sendable {
 
   // MARK: Additional IndexStoreDB index roles
 
-  // Note: the imported constant INDEXSTOREDB_SYMBOL_ROLE_CANONICAL is signed by default and
-  // fails to construct in Swift.
-  public static let canonical: SymbolRole = SymbolRole(rawValue: 1 << 63)
+  public static let canonical: SymbolRole = SymbolRole(rawValue: INDEXSTOREDB_SYMBOL_ROLE_CANONICAL)
 
   public static let all: SymbolRole = SymbolRole(rawValue: ~0)
 
diff --git a/include/CIndexStoreDB/CIndexStoreDB.h b/include/CIndexStoreDB/CIndexStoreDB.h
index 734e823..12a4e69 100644
--- a/include/CIndexStoreDB/CIndexStoreDB.h
+++ b/include/CIndexStoreDB/CIndexStoreDB.h
@@ -59,7 +59,7 @@ typedef void *indexstoredb_symbol_location_t;
 typedef void *indexstoredb_symbol_relation_t;
 typedef void *indexstoredb_unit_info_t;
 
-typedef enum {
+typedef enum : uint64_t {
   INDEXSTOREDB_SYMBOL_ROLE_DECLARATION = 1 << 0,
   INDEXSTOREDB_SYMBOL_ROLE_DEFINITION  = 1 << 1,
   INDEXSTOREDB_SYMBOL_ROLE_REFERENCE   = 1 << 2,
@@ -82,7 +82,7 @@ typedef enum {
   INDEXSTOREDB_SYMBOL_ROLE_REL_IBTYPEOF    = 1 << 17,
   INDEXSTOREDB_SYMBOL_ROLE_REL_SPECIALIZATIONOF = 1 << 18,
 
-  INDEXSTOREDB_SYMBOL_ROLE_CANONICAL = 1 << 63,
+  INDEXSTOREDB_SYMBOL_ROLE_CANONICAL = (uint64_t)1 << 63,
 } indexstoredb_symbol_role_t;
 
 typedef enum {