diff --git a/peglib.h b/peglib.h
index 1b210f8..a03a220 100644
--- a/peglib.h
+++ b/peglib.h
@@ -2199,10 +2199,10 @@ public:
         return (*grammar_)[s];
     }
 
-    void enable_packrat_parsing(bool sw) {
+    void enable_packrat_parsing() {
         if (grammar_ != nullptr) {
             auto& rule = (*grammar_)[start_];
-            rule.enablePackratParsing = sw;
+            rule.enablePackratParsing = true;
         }
     }
 
diff --git a/test/test.cc b/test/test.cc
index 31a1cfd..41c6fe6 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -244,7 +244,7 @@ TEST_CASE("Backtracking test", "[general]")
         count++;
     };
 
-    parser.enable_packrat_parsing(true);
+    parser.enable_packrat_parsing();
 
     bool ret = parser.parse("Hello Two");
     REQUIRE(ret == true);