diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 1092dfa9f55..576d22227da 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -3790,7 +3790,7 @@ void Tokenizer::simplifyParenthesizedLibraryFunctions()
         if (!Token::simpleMatch(tok, ") ("))
             continue;
         Token *rpar = tok, *lpar = tok->link();
-        if (!lpar || Token::Match(lpar->previous(), "%name%"))
+        if (!lpar || (Token::Match(lpar->previous(), "%name%") && !lpar->previous()->isKeyword()))
             continue;
         const Token *ftok = rpar->previous();
         if (mSettings.library.isNotLibraryFunction(ftok))
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 38611c803e0..eff4a8d44f2 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -184,6 +184,7 @@ class TestTokenizer : public TestFixture {
         TEST_CASE(removeParentheses26);      // Ticket #8875 a[0](0)
         TEST_CASE(removeParentheses27);
         TEST_CASE(removeParentheses28);      // #12164 - don't remove parentheses in '(expr1) ? (expr2) : (expr3);'
+        TEST_CASE(removeParantheses29);      // #13735
 
         TEST_CASE(tokenize_double);
         TEST_CASE(tokenize_strings);
@@ -2179,6 +2180,18 @@ class TestTokenizer : public TestFixture {
         ASSERT_EQUALS(exp, tokenizeAndStringify(code));
     }
 
+    void removeParantheses29() { // Ticket #13735
+        static char code[] = "double foo(void)\n"
+                             "{\n"
+                             "return (modf)(12.3, NULL);\n"
+                             "}";
+        static const char exp[] = "double foo ( )\n"
+                                  "{\n"
+                                  "return modf ( 12.3 , NULL ) ;\n"
+                                  "}";
+        ASSERT_EQUALS(exp, tokenizeAndStringify(code));
+    }
+
     void tokenize_double() {
         const char code[] = "void f() {\n"
                             "    double a = 4.2;\n"