diff --git a/fs_interface/OpenFile.h b/fs_interface/OpenFile.h
index 290faedb..4f1b464c 100644
--- a/fs_interface/OpenFile.h
+++ b/fs_interface/OpenFile.h
@@ -14,7 +14,7 @@ public:
 
   virtual void stat(struct ::stat *result) const = 0;
   virtual void truncate(off_t size) const = 0;
-  virtual ssize_t read(void *buf, size_t count, off_t offset) const = 0;
+  virtual size_t read(void *buf, size_t count, off_t offset) const = 0;
   virtual void write(const void *buf, size_t count, off_t offset) = 0;
   virtual void flush() = 0;
   virtual void fsync() = 0;
diff --git a/fuse/Filesystem.h b/fuse/Filesystem.h
index f406de3f..c47dbccb 100644
--- a/fuse/Filesystem.h
+++ b/fuse/Filesystem.h
@@ -27,7 +27,7 @@ public:
   virtual void chown(const boost::filesystem::path &path, uid_t uid, gid_t gid) = 0;
   virtual void truncate(const boost::filesystem::path &path, off_t size) = 0;
   virtual void ftruncate(int descriptor, off_t size) = 0;
-  virtual int read(int descriptor, void *buf, size_t count, off_t offset) = 0;
+  virtual size_t read(int descriptor, void *buf, size_t count, off_t offset) = 0;
   virtual void write(int descriptor, const void *buf, size_t count, off_t offset) = 0;
   virtual void fsync(int descriptor) = 0;
   virtual void fdatasync(int descriptor) = 0;
diff --git a/impl/FilesystemImpl.cpp b/impl/FilesystemImpl.cpp
index 5e8cdff7..6cd876b9 100644
--- a/impl/FilesystemImpl.cpp
+++ b/impl/FilesystemImpl.cpp
@@ -195,7 +195,7 @@ void FilesystemImpl::ftruncate(int descriptor, off_t size) {
   _open_files.get(descriptor)->truncate(size);
 }
 
-int FilesystemImpl::read(int descriptor, void *buf, size_t count, off_t offset) {
+size_t FilesystemImpl::read(int descriptor, void *buf, size_t count, off_t offset) {
   PROFILE(_readNanosec);
   return _open_files.get(descriptor)->read(buf, count, offset);
 }
diff --git a/impl/FilesystemImpl.h b/impl/FilesystemImpl.h
index 6f97b514..f29e4913 100644
--- a/impl/FilesystemImpl.h
+++ b/impl/FilesystemImpl.h
@@ -31,7 +31,7 @@ public:
 	void chown(const boost::filesystem::path &path, uid_t uid, gid_t gid) override;
 	void truncate(const boost::filesystem::path &path, off_t size) override;
 	void ftruncate(int descriptor, off_t size) override;
-	int read(int descriptor, void *buf, size_t count, off_t offset) override;
+	size_t read(int descriptor, void *buf, size_t count, off_t offset) override;
 	void write(int descriptor, const void *buf, size_t count, off_t offset) override;
 	void fsync(int descriptor) override;
 	void fdatasync(int descriptor) override;