diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
index 2a2cee2..1c92f91 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
@@ -201,14 +201,10 @@
 static constexpr uint8_t kCowReadAheadDone = 2;
 
 static constexpr uint64_t kCowOpSourceInfoDataMask = (1ULL << 48) - 1;
-static constexpr uint64_t kCowOpSourceInfoCompressBit = (1ULL << 63);
 
 static inline uint64_t GetCowOpSourceInfoData(const CowOperation* op) {
     return op->source_info & kCowOpSourceInfoDataMask;
 }
-static inline bool GetCowOpSourceInfoCompression(const CowOperation* op) {
-    return !!(op->source_info & kCowOpSourceInfoCompressBit);
-}
 
 struct CowFooter {
     CowFooterOperation op;
diff --git a/fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp
index 58dca64..5ab4f7a 100644
--- a/fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_format.cpp
@@ -83,11 +83,6 @@
     os << "CowOperation(";
     EmitCowTypeString(os, op.type);
     if (op.type == kCowReplaceOp || op.type == kCowXorOp || op.type == kCowSequenceOp) {
-        if (op.source_info & kCowOpSourceInfoCompressBit) {
-            os << ", compressed";
-        } else {
-            os << ", uncompressed";
-        }
         os << ", data_length:" << op.data_length;
     }
     if (op.type != kCowClusterOp && op.type != kCowSequenceOp && op.type != kCowLabelOp) {
diff --git a/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
index bf50f2f..0285c17 100644
--- a/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/cow_reader.cpp
@@ -136,7 +136,6 @@
                            << v2_op.compression << ", op: " << v2_op;
                 return false;
             }
-            source_info |= kCowOpSourceInfoCompressBit;
         }
         new_op.source_info = source_info;
     }
diff --git a/fs_mgr/libsnapshot/libsnapshot_cow/test_v2.cpp b/fs_mgr/libsnapshot/libsnapshot_cow/test_v2.cpp
index 8f3f03f..100b137 100644
--- a/fs_mgr/libsnapshot/libsnapshot_cow/test_v2.cpp
+++ b/fs_mgr/libsnapshot/libsnapshot_cow/test_v2.cpp
@@ -143,7 +143,6 @@
     op = iter->Get();
 
     ASSERT_EQ(op->type, kCowReplaceOp);
-    ASSERT_FALSE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->data_length, 4096);
     ASSERT_EQ(op->new_block, 50);
     ASSERT_TRUE(ReadData(reader, op, sink.data(), sink.size()));
@@ -219,7 +218,6 @@
     op = iter->Get();
 
     ASSERT_EQ(op->type, kCowXorOp);
-    ASSERT_FALSE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->data_length, 4096);
     ASSERT_EQ(op->new_block, 50);
     ASSERT_EQ(GetCowOpSourceInfoData(op), 98314);  // 4096 * 24 + 10
@@ -276,7 +274,6 @@
     std::string sink(data.size(), '\0');
 
     ASSERT_EQ(op->type, kCowReplaceOp);
-    ASSERT_TRUE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->data_length, 56);  // compressed!
     ASSERT_EQ(op->new_block, 50);
     ASSERT_TRUE(ReadData(reader, op, sink.data(), sink.size()));
@@ -523,7 +520,6 @@
     std::string sink(data.size(), '\0');
 
     ASSERT_EQ(op->type, kCowReplaceOp);
-    ASSERT_TRUE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->data_length, 56);  // compressed!
     ASSERT_EQ(op->new_block, 50);
     ASSERT_TRUE(ReadData(reader, op, sink.data(), sink.size()));
@@ -541,7 +537,6 @@
 
     sink = {};
     sink.resize(data2.size(), '\0');
-    ASSERT_TRUE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->data_length, 41);  // compressed!
     ASSERT_EQ(op->new_block, 51);
     ASSERT_TRUE(ReadData(reader, op, sink.data(), sink.size()));
@@ -586,7 +581,6 @@
 
     auto op = iter->Get();
     ASSERT_EQ(op->type, kCowReplaceOp);
-    ASSERT_TRUE(GetCowOpSourceInfoCompression(op));
     ASSERT_EQ(op->new_block, 51);
     ASSERT_TRUE(ReadData(reader, op, sink.data(), sink.size()));
 }