diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index c4df03341..76133db55 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -4607,7 +4607,7 @@ bool Tokenizer::simplifyFunctionParameters()
         }
 
         // Find the function e.g. foo( x ) or foo( x, y )
-        else if (Token::Match(tok, "%var% ( %var% [,)]")) {
+        else if (Token::Match(tok, "%var% ( %var% [,)]") && tok->strAt(-1) != ":") {
             // We have found old style function, now we need to change it
 
             // First step: Get list of argument names in parenthesis
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 00f1571ef..35fd01a1e 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -290,6 +290,7 @@ private:
 
         TEST_CASE(simplifyFunctionParameters);
         TEST_CASE(simplifyFunctionParameters1); // #3721
+        TEST_CASE(simplifyFunctionParameters2); // #4430
         TEST_CASE(simplifyFunctionParametersErrors);
 
         TEST_CASE(removeParentheses1);       // Ticket #61
@@ -4685,6 +4686,16 @@ private:
                       "}", tokenizeAndStringify(code));
     }
 
+    void simplifyFunctionParameters2() { // #4430
+        const char code[] = "class Item { "
+                            "int i ; "
+                            "public: "
+                            "Item ( int i ) ; "
+                            "} ; "
+                            "Item :: Item ( int i ) : i ( i ) { }";
+        ASSERT_EQUALS(code, tokenizeAndStringify(code));
+    }
+
     void simplifyFunctionParametersErrors() {
         //same parameters...
         tokenizeAndStringify("void foo(x, x)\n"