diff --git a/src/journal/JournalTrimmer.cc b/src/journal/JournalTrimmer.cc
index 5e68349513cfa..a4adb521ec7f3 100644
--- a/src/journal/JournalTrimmer.cc
+++ b/src/journal/JournalTrimmer.cc
@@ -13,6 +13,22 @@
 
 namespace journal {
 
+struct JournalTrimmer::C_RemoveSet : public Context {
+  JournalTrimmer *journal_trimmer;
+  uint64_t object_set;
+  Mutex lock;
+  uint32_t refs;
+  int return_value;
+
+  C_RemoveSet(JournalTrimmer *_journal_trimmer, uint64_t _object_set,
+              uint8_t _splay_width);
+  virtual void complete(int r);
+  virtual void finish(int r) {
+    journal_trimmer->handle_set_removed(r, object_set);
+    journal_trimmer->m_async_op_tracker.finish_op();
+  }
+};
+
 JournalTrimmer::JournalTrimmer(librados::IoCtx &ioctx,
                                const std::string &object_oid_prefix,
                                const JournalMetadataPtr &journal_metadata)
diff --git a/src/journal/JournalTrimmer.h b/src/journal/JournalTrimmer.h
index 89de0205cbf8b..55379be7bbdb7 100644
--- a/src/journal/JournalTrimmer.h
+++ b/src/journal/JournalTrimmer.h
@@ -58,21 +58,8 @@ class JournalTrimmer {
     virtual void finish(int r) {
     }
   };
-  struct C_RemoveSet : public Context {
-    JournalTrimmer *journal_trimmer;
-    uint64_t object_set;
-    Mutex lock;
-    uint32_t refs;
-    int return_value;
-
-    C_RemoveSet(JournalTrimmer *_journal_trimmer, uint64_t _object_set,
-                uint8_t _splay_width);
-    virtual void complete(int r);
-    virtual void finish(int r) {
-      journal_trimmer->handle_set_removed(r, object_set);
-      journal_trimmer->m_async_op_tracker.finish_op();
-    }
-  };
+
+  struct C_RemoveSet;
 
   librados::IoCtx m_ioctx;
   CephContext *m_cct;