diff --git a/src/rime/algo/syllabifier.cc b/src/rime/algo/syllabifier.cc
index 75437f6332..9fb9b7a689 100644
--- a/src/rime/algo/syllabifier.cc
+++ b/src/rime/algo/syllabifier.cc
@@ -67,7 +67,7 @@ int Syllabifier::BuildSyllableGraph(const string& input,
         for (auto accessor = prism.QuerySpelling(m.first);
              !accessor.exhausted(); accessor.Next()) {
           if (accessor.properties().type == kNormalSpelling) {
-            matches.push_back({m.first, m.second.length});
+            matches.push_back({m.first, m.second.length, m.second.distance});
             break;
           }
         }
@@ -110,7 +110,7 @@ int Syllabifier::BuildSyllableGraph(const string& input,
                 continue;
               }
               props.is_correction = true;
-              props.credibility = kCorrectionCredibility;
+              props.credibility = kCorrectionCredibility * m.distance;
             }
             auto it = spellings.find(syllable_id);
             if (it == spellings.end()) {
diff --git a/src/rime/dict/prism.h b/src/rime/dict/prism.h
index 7839b5f58d..ac18f83f3b 100644
--- a/src/rime/dict/prism.h
+++ b/src/rime/dict/prism.h
@@ -65,7 +65,9 @@ class Script;
 
 class Prism : public MappedFile {
  public:
-  using Match = Darts::DoubleArray::result_pair_type;
+  struct Match : Darts::DoubleArray::result_pair_type {
+    size_t distance = 0;
+  };
 
   RIME_API explicit Prism(const path& file_path);