diff --git a/lib/compiler/passes/generate-bytecode.js b/lib/compiler/passes/generate-bytecode.js
index 32997f4..fa4798f 100644
--- a/lib/compiler/passes/generate-bytecode.js
+++ b/lib/compiler/passes/generate-bytecode.js
@@ -632,7 +632,7 @@ function generateBytecode(ast) {
                 + classDescriptionEscape(part[1])
               : classDescriptionEscape(part);
           }).join("")
-        + "]" + (node.ignoreCase ? "i" : "");
+        + "]";
 
       regexpIndex   = addConst(regexp);
       expectedIndex = addConst([
diff --git a/lib/parser.js b/lib/parser.js
index e5947cc..c3a07f1 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -288,7 +288,7 @@
         peg$c129 = /^[0-9]/,
         peg$c130 = { type: "class", value: "[0-9]", description: "[0-9]" },
         peg$c131 = /^[0-9a-f]/i,
-        peg$c132 = { type: "class", value: "[0-9a-f]i", description: "[0-9a-f]i" },
+        peg$c132 = { type: "class", value: "[0-9a-f]i", description: "[0-9a-f]" },
         peg$c133 = ".",
         peg$c134 = { type: "literal", value: ".", description: "\".\"" },
         peg$c135 = function() { return { type: "any", location: location() }; },
diff --git a/spec/unit/compiler/passes/generate-bytecode.spec.js b/spec/unit/compiler/passes/generate-bytecode.spec.js
index 1995b9c..9fdad43 100644
--- a/spec/unit/compiler/passes/generate-bytecode.spec.js
+++ b/spec/unit/compiler/passes/generate-bytecode.spec.js
@@ -616,7 +616,7 @@ describe("compiler pass |generateBytecode|", function() {
       it("defines correct constants", function() {
         expect(pass).toChangeAST('start = [a]i', constsDetails([
           '/^[a]/i',
-          '{ type: "class", value: "[a]i", description: "[a]i" }'
+          '{ type: "class", value: "[a]i", description: "[a]" }'
         ]));
       });
     });