diff --git a/src/string_search.h b/src/string_search.h
index b339c355fe168d..3d06f32058f673 100644
--- a/src/string_search.h
+++ b/src/string_search.h
@@ -100,17 +100,29 @@ class StringSearch : private StringSearchBase {
     CHECK_GT(pattern_length, 0);
     if (pattern_length < kBMMinPatternLength) {
       if (pattern_length == 1) {
-        strategy_ = &StringSearch::SingleCharSearch;
+        strategy_ = SearchStrategy::kSingleChar;
         return;
       }
-      strategy_ = &StringSearch::LinearSearch;
+      strategy_ = SearchStrategy::kLinear;
       return;
     }
-    strategy_ = &StringSearch::InitialSearch;
+    strategy_ = SearchStrategy::kInitial;
   }
 
   size_t Search(Vector subject, size_t index) {
-    return (this->*strategy_)(subject, index);
+    switch (strategy_) {
+      case kBoyerMooreHorspool:
+        return BoyerMooreHorspoolSearch(subject, index);
+      case kBoyerMoore:
+        return BoyerMooreSearch(subject, index);
+      case kInitial:
+        return InitialSearch(subject, index);
+      case kLinear:
+        return LinearSearch(subject, index);
+      case kSingleChar:
+        return SingleCharSearch(subject, index);
+    }
+    UNREACHABLE();
   }
 
   static inline int AlphabetSize() {
@@ -149,10 +161,17 @@ class StringSearch : private StringSearchBase {
     return bad_char_occurrence[equiv_class];
   }
 
+  enum SearchStrategy {
+    kBoyerMooreHorspool,
+    kBoyerMoore,
+    kInitial,
+    kLinear,
+    kSingleChar,
+  };
+
   // The pattern to search for.
   Vector pattern_;
-  // Pointer to implementation of the search.
-  SearchFunction strategy_;
+  SearchStrategy strategy_;
   // Cache value of Max(0, pattern_length() - kBMMaxShift)
   size_t start_;
 };
@@ -476,7 +495,7 @@ size_t StringSearch<Char>::BoyerMooreHorspoolSearch(
     badness += (pattern_length - j) - last_char_shift;
     if (badness > 0) {
       PopulateBoyerMooreTable();
-      strategy_ = &StringSearch::BoyerMooreSearch;
+      strategy_ = SearchStrategy::kBoyerMoore;
       return BoyerMooreSearch(subject, index);
     }
   }
@@ -548,7 +567,7 @@ size_t StringSearch<Char>::InitialSearch(
       badness += j;
     } else {
       PopulateBoyerMooreHorspoolTable();
-      strategy_ = &StringSearch::BoyerMooreHorspoolSearch;
+      strategy_ = SearchStrategy::kBoyerMooreHorspool;
       return BoyerMooreHorspoolSearch(subject, i);
     }
   }