diff --git a/caching/superblock.cc b/caching/superblock.cc
index b4b6270..93a8d60 100644
--- a/caching/superblock.cc
+++ b/caching/superblock.cc
@@ -83,6 +83,12 @@ superblock_flags::set_flag(superblock_flags::flag f)
 	flags_.insert(f);
 }
 
+void
+superblock_flags::clear_flag(superblock_flags::flag f)
+{
+	flags_.erase(f);
+}
+
 bool
 superblock_flags::get_flag(flag f) const
 {
diff --git a/caching/superblock.h b/caching/superblock.h
index fb7af3c..2c2cf30 100644
--- a/caching/superblock.h
+++ b/caching/superblock.h
@@ -30,6 +30,7 @@ namespace caching {
 		superblock_flags(uint32_t bits);
 
 		void set_flag(flag f);
+		void clear_flag(flag f);
 		bool get_flag(flag f) const;
 		uint32_t encode() const;
 		uint32_t get_unhandled_flags() const;