diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 285b32733..ace85df70 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -7985,7 +7985,7 @@ void Tokenizer::simplifyComma()
                         // Handle "delete a, a = 0;"
                         tok->str(";");
                         break;
-                    } else if (Token::Match(tok2, "[;,{}()]")) {
+                    } else if (Token::Match(tok2, "[:;,{}()]")) {
                         break;
                     }
                 }
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index a4efc7851..6779e5693 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -2733,6 +2733,12 @@ private:
                                 "}\n";
             ASSERT_EQUALS("void f ( ) { char buf [ BUFSIZ ] ; char * * p ; char * ptrs [ BUFSIZ ] ; char * * pp ; }", tok(code));
         }
+
+        {
+            // #4786 - don't replace , with ; in ".. : public B, C .." code
+            const char code[] = "template < class T = X > class A : public B , C { } ;";
+            ASSERT_EQUALS(code, tok(code));
+        }
     }
 
     void remove_comma() {