diff --git a/lib/checktype.cpp b/lib/checktype.cpp
index 7bb832622..3c0738c05 100644
--- a/lib/checktype.cpp
+++ b/lib/checktype.cpp
@@ -306,12 +306,16 @@ static const ValueFlow::Value *mismatchingValue(const ValueType *enumType, const
     if (!enumType || !enumType->typeScope || enumType->typeScope->type != Scope::eEnum)
         return nullptr;
     const Scope * const enumScope = enumType->typeScope;
+    for (unsigned int i = 0; i < enumScope->enumeratorList.size(); ++i) {
+        if (!enumScope->enumeratorList[i].value_known)
+            return nullptr;
+    }
     for (std::list<ValueFlow::Value>::const_iterator it = values.begin(); it != values.end(); ++it) {
         if (it->tokvalue)
             continue;
         bool found = false;
         for (unsigned int i = 0; i < enumScope->enumeratorList.size(); ++i) {
-            if (enumScope->enumeratorList[i].value_known && enumScope->enumeratorList[i].value == it->intvalue) {
+            if (enumScope->enumeratorList[i].value == it->intvalue) {
                 found = true;
                 break;
             }
diff --git a/test/testtype.cpp b/test/testtype.cpp
index 86ac3adb7..88a91f102 100644
--- a/test/testtype.cpp
+++ b/test/testtype.cpp
@@ -211,6 +211,12 @@ private:
               "  enum ABC abc = 5;\n"
               "}", &settings);
         ASSERT_EQUALS("[test.cpp:3]: (style) Assigning mismatching value 5 to enum variable.\n", errout.str());
+
+        check("enum ABC {A=X,B,C};\n" // #7493 => enum constants for ABC has unknown values
+              "void f() {\n"
+              "  enum ABC abc = 5;\n"
+              "}", &settings);
+        ASSERT_EQUALS("", errout.str());
     }
 
     void enumMismatchCompare() {