diff --git a/net/disk_cache/cache_util.h b/net/disk_cache/cache_util.h
index 641f15476a39a..22da27450b01f 100644
--- a/net/disk_cache/cache_util.h
+++ b/net/disk_cache/cache_util.h
@@ -20,7 +20,7 @@ namespace disk_cache {
 
 // Experiment to increase the cache size to see the impact on various
 // performance metrics.
-NET_EXPORT_PRIVATE extern const base::Feature kChangeDiskCacheSizeExperiment;
+NET_EXPORT_PRIVATE BASE_DECLARE_FEATURE(kChangeDiskCacheSizeExperiment);
 
 // Moves the cache files from the given path to another location.
 // Fails if the destination exists already, or if it doesn't have
diff --git a/net/disk_cache/simple/simple_synchronous_entry.h b/net/disk_cache/simple/simple_synchronous_entry.h
index f268ab2ea4cb5..a8610d2676ef5 100644
--- a/net/disk_cache/simple/simple_synchronous_entry.h
+++ b/net/disk_cache/simple/simple_synchronous_entry.h
@@ -41,7 +41,7 @@ namespace disk_cache {
 class BackendFileOperations;
 class UnboundBackendFileOperations;
 
-NET_EXPORT_PRIVATE extern const base::Feature kSimpleCachePrefetchExperiment;
+NET_EXPORT_PRIVATE BASE_DECLARE_FEATURE(kSimpleCachePrefetchExperiment);
 NET_EXPORT_PRIVATE extern const char kSimpleCacheFullPrefetchBytesParam[];
 NET_EXPORT_PRIVATE extern const char
     kSimpleCacheTrailerPrefetchSpeculativeBytesParam[];