diff --git a/src/include/fb_blk.h b/src/include/fb_blk.h
index b57443f3c4..65142f4d5c 100644
--- a/src/include/fb_blk.h
+++ b/src/include/fb_blk.h
@@ -170,8 +170,8 @@ public:
 
 private:
     // These operators are off-limits
-	void* operator new(size_t s) { return 0; }
-    void* operator new[](size_t s) { return 0; }
+	void* operator new(size_t) { return 0; }
+    void* operator new[](size_t) { return 0; }
 };
 
 template<typename RPT, BlockType BLOCK_TYPE = type_unknown>
@@ -193,16 +193,16 @@ public:
 
 private:
     // These operations are not supported on static repeat-base objects
-    void* operator new[](size_t s, MemoryPool& p)
+    void* operator new[](size_t /*s*/, MemoryPool& /*p*/)
         { return 0; }
-    void operator delete[](void* mem, MemoryPool& p)
+    void operator delete[](void* /*mem*/, MemoryPool& /*p*/)
         { }
-    void operator delete[](void* mem)
+    void operator delete[](void* /*mem*/)
 		{ }
 
     // These operators are off-limits
-	void* operator new(size_t s) { return 0; }
-    void* operator new[](size_t s) { return 0; }
+	void* operator new(size_t) { return 0; }
+    void* operator new[](size_t) { return 0; }
 };
 
 #endif	// INCLUDE_FB_BLK
diff --git a/src/jrd/jrd.h b/src/jrd/jrd.h
index 59abafee34..beeb9c9f17 100644
--- a/src/jrd/jrd.h
+++ b/src/jrd/jrd.h
@@ -988,11 +988,11 @@ inline Jrd::thread_db* JRD_get_thread_data()
 	return (Jrd::thread_db*) ThreadData::getSpecific();
 }
 
-inline void CHECK_DBB(const Jrd::Database* dbb)
+inline void CHECK_DBB(const Jrd::Database*)
 {
 }
 
-inline void CHECK_TDBB(const Jrd::thread_db* tdbb)
+inline void CHECK_TDBB(const Jrd::thread_db*)
 {
 }