diff --git a/lib/astutils.cpp b/lib/astutils.cpp
index b8e86b3e29d..34f8a73ddd1 100644
--- a/lib/astutils.cpp
+++ b/lib/astutils.cpp
@@ -2628,7 +2628,7 @@ bool isVariableChanged(const Token *tok, int indirect, const Settings &settings,
     if (!tok->isMutableExpr())
         return false;
 
-    if (indirect == 0 && isConstVarExpression(tok))
+    if (isConstVarExpression(tok))
         return false;
 
     const Token *tok2 = tok;
@@ -3370,7 +3370,7 @@ bool isConstVarExpression(const Token *tok, const std::function<bool(const Token
     if (!tok)
         return false;
     if (tok->str() == "?" && tok->astOperand2() && tok->astOperand2()->str() == ":") // ternary operator
-        return isConstVarExpression(tok->astOperand2()->astOperand1()) && isConstVarExpression(tok->astOperand2()->astOperand2()); // left and right of ":"
+        return isConstVarExpression(tok->astOperand2()->astOperand1()) || isConstVarExpression(tok->astOperand2()->astOperand2()); // left and right of ":"
     if (skipPredicate && skipPredicate(tok))
         return false;
     if (Token::simpleMatch(tok->previous(), "sizeof ("))
diff --git a/test/testother.cpp b/test/testother.cpp
index 241a7512000..63a58b226d6 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -4775,6 +4775,18 @@ class TestOther : public TestFixture {
               "    strcpy(r.c, p->c_str());\n"
               "}\n");
         ASSERT_EQUALS("[test.cpp:7:21]: (style) Parameter 'p' can be declared as pointer to const [constParameterPointer]\n", errout_str());
+
+        check("struct S {\n" // #14559
+              "    int gc() const;\n"
+              "    int gnc();\n"
+              "};\n"
+              "int f1(S* s) {\n"
+              "    return h(s ? s->gc() : 1);\n"
+              "}\n"
+              "int f2(S* s) {\n"
+              "    return h(s ? s->gnc() : 1);\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:5:11]: (style) Parameter 's' can be declared as pointer to const [constParameterPointer]\n", errout_str());
     }
 
     void constArray() {