diff --git a/lib/templatesimplifier.cpp b/lib/templatesimplifier.cpp
index 478dca9ae..2b97893cf 100644
--- a/lib/templatesimplifier.cpp
+++ b/lib/templatesimplifier.cpp
@@ -1092,17 +1092,19 @@ bool TemplateSimplifier::simplifyTemplateInstantiations(
             else if (indentlevel > 0 && Token::Match(tok3, "> [,>]"))
                 --indentlevel;
             templateMatchPattern += tok3->str();
-            templateMatchPattern += " ";
+            templateMatchPattern += ' ';
             if (indentlevel == 0 && Token::Match(tok3->previous(), "[<,]"))
                 typesUsedInTemplateInstantiation.push_back(tok3);
             // add additional type information
-            if (tok3->isUnsigned())
-                typeForNewNameStr += "unsigned";
-            else if (tok3->isSigned())
-                typeForNewNameStr += "signed";
-            if (tok3->isLong())
-                typeForNewNameStr += "long";
-            typeForNewNameStr += tok3->str();
+            if (tok3->str() != "class") {
+                if (tok3->isUnsigned())
+                    typeForNewNameStr += "unsigned";
+                else if (tok3->isSigned())
+                    typeForNewNameStr += "signed";
+                if (tok3->isLong())
+                    typeForNewNameStr += "long";
+                typeForNewNameStr += tok3->str();
+            }
         }
         templateMatchPattern += ">";
         const std::string typeForNewName(typeForNewNameStr);
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index 78b42781b..9c5c2c8fb 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -128,6 +128,7 @@ private:
         TEST_CASE(template34);  // #3706 - namespace => hang
         TEST_CASE(template35);  // #4074 - A<'x'> a;
         TEST_CASE(template36);  // #4310 - passing unknown template instantiation as template argument
+        TEST_CASE(template37);  // #4544 - A<class B> a;
         TEST_CASE(template_unhandled);
         TEST_CASE(template_default_parameter);
         TEST_CASE(template_default_type);
@@ -2252,6 +2253,15 @@ private:
                       tok(code));
     }
 
+    void template37() { // #4544 - A<class B> a;
+        const char code[] = "class A { };\n"
+                            "template<class T> class B {};\n"
+                            "B<class A> b1;\n"
+                            "B<A> b2;";
+        ASSERT_EQUALS("class A { } ; B<A> b1 ; B<A> b2 ; class B<A> { }",
+                      tok(code));
+    }
+
     void template_unhandled() {
         // An unhandled template usage should be simplified..
         ASSERT_EQUALS("x<int> ( ) ;", tok("x<int>();"));