diff --git a/airdcpp-core/airdcpp/File.h b/airdcpp-core/airdcpp/File.h
index 379b0502..76d279f5 100644
--- a/airdcpp-core/airdcpp/File.h
+++ b/airdcpp-core/airdcpp/File.h
@@ -110,7 +110,7 @@ class File: public IOStream {
 	~File();
 
 	bool isOpen() const noexcept;
-	int64_t getSize() const noexcept;
+	int64_t getSize() const noexcept override;
 	void setSize(int64_t newSize);
 
 	int64_t getPos() const noexcept;
diff --git a/airdcpp-core/airdcpp/FilteredFile.h b/airdcpp-core/airdcpp/FilteredFile.h
index def4c2df..30507476 100644
--- a/airdcpp-core/airdcpp/FilteredFile.h
+++ b/airdcpp-core/airdcpp/FilteredFile.h
@@ -217,7 +217,7 @@ class FilteredInputStream : public InputStream {
 		return as->releaseRootStream();
 	}
 
-	int64_t getSize() const noexcept {
+	int64_t getSize() const noexcept override {
 		return f->getSize();
 	}
 private:
diff --git a/airdcpp-core/airdcpp/SharedFileStream.h b/airdcpp-core/airdcpp/SharedFileStream.h
index bf8c42bd..5bc2d103 100644
--- a/airdcpp-core/airdcpp/SharedFileStream.h
+++ b/airdcpp-core/airdcpp/SharedFileStream.h
@@ -48,7 +48,7 @@ class SharedFileStream : public IOStream
 	size_t write(const void* buf, size_t len) override;
 	size_t read(void* buf, size_t& len) override;
 
-	int64_t getSize() const noexcept;
+	int64_t getSize() const noexcept override;
 	void setSize(int64_t newSize);
 
 	size_t flushBuffers(bool aForce) override;
diff --git a/airdcpp-core/airdcpp/Streams.h b/airdcpp-core/airdcpp/Streams.h
index 336257c1..7574c628 100644
--- a/airdcpp-core/airdcpp/Streams.h
+++ b/airdcpp-core/airdcpp/Streams.h
@@ -53,7 +53,7 @@ class MemoryInputStream : public InputStream {
 		return len;
 	}
 
-	int64_t getSize() const noexcept { return static_cast<int64_t>(size); }
+	int64_t getSize() const noexcept override { return static_cast<int64_t>(size); }
 
 private:
 	size_t pos = 0;
@@ -116,7 +116,7 @@ class LimitedInputStream : public InputStream {
 		return as->releaseRootStream();
 	}
 
-	int64_t getSize() const noexcept {
+	int64_t getSize() const noexcept override {
 		return s->getSize();
 	}
 private: