diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index b4eeb831b..ce510ac34 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -7373,6 +7373,9 @@ void Tokenizer::simplifyEnum()
                                    (tok2->next()->isName() || tok2->next()->str() == "(")) {
                             simplify = true;
                             hasClass = false;
+                        } else if (tok2->previous()->str() == "(" && tok2->next()->str() == ")") {
+                            simplify = true;
+                            hasClass = false;
                         }
                     }
 
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index 05cc1335c..8c9424b55 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -356,6 +356,7 @@ private:
         TEST_CASE(enum33); // ticket #4015 (segmentation fault)
         TEST_CASE(enum34); // ticket #4141 (division by zero)
         TEST_CASE(enum35); // ticket #3953 (avoid simplification of type)
+        TEST_CASE(enum36); // ticket #4378
         TEST_CASE(enumscope1); // ticket #3949
         TEST_CASE(duplicateDefinition); // ticket #3565
 
@@ -7241,6 +7242,11 @@ private:
         ASSERT_EQUALS("void f ( A * a ) { }", checkSimplifyEnum("enum { A }; void f(A * a) { }"));
     }
 
+    void enum36() {  // #4378
+        const char code[] = "struct X { enum Y { a, b }; X(Y) { Y y = (Y)1; } };";
+        ASSERT_EQUALS("struct X { X ( int ) { int y ; y = ( int ) 1 ; } } ;", checkSimplifyEnum(code));
+    }
+
     void enumscope1() { // #3949 - don't simplify enum from one function in another function
         const char code[] = "void foo() { enum { A = 0, B = 1 }; }\n"
                             "void bar() { int a = A; }";