diff --git a/lib/astutils.cpp b/lib/astutils.cpp
index 733f5f047..8741df872 100644
--- a/lib/astutils.cpp
+++ b/lib/astutils.cpp
@@ -2413,7 +2413,7 @@ static bool isExpressionChangedAt(const F& getExprTok,
     if (depth < 0)
         return true;
     if (tok->exprId() != exprid) {
-        if (globalvar && !tok->isKeyword() && Token::Match(tok, "%name% ("))
+        if (globalvar && !tok->isKeyword() && Token::Match(tok, "%name% (") && !(tok->function() && tok->function()->isAttributePure()))
             // TODO: Is global variable really changed by function call?
             return true;
         const bool pointer = astIsPointer(tok);
diff --git a/lib/checkcondition.cpp b/lib/checkcondition.cpp
index 60dcc1e05..9baa251bd 100644
--- a/lib/checkcondition.cpp
+++ b/lib/checkcondition.cpp
@@ -513,9 +513,10 @@ void CheckCondition::multiCondition()
 
             if (tok2->astOperand2()) {
                 ErrorPath errorPath;
-                if (isOverlappingCond(cond1, tok2->astOperand2(), true))
+                if (isOverlappingCond(cond1, tok2->astOperand2(), true) && !isExpressionChanged(cond1, cond1, tok2->astOperand2(), mSettings, mTokenizer->isCPP()))
                     overlappingElseIfConditionError(tok2->astOperand2(), cond1->linenr());
-                else if (isOppositeCond(true, mTokenizer->isCPP(), cond1, tok2->astOperand2(), mSettings->library, true, true, &errorPath))
+                else if (isOppositeCond(true, mTokenizer->isCPP(), cond1, tok2->astOperand2(), mSettings->library, true, true, &errorPath) &&
+                         !isExpressionChanged(cond1, cond1, tok2->astOperand2(), mSettings, mTokenizer->isCPP()))
                     oppositeElseIfConditionError(cond1, tok2->astOperand2(), errorPath);
             }
         }
diff --git a/test/testcondition.cpp b/test/testcondition.cpp
index 9db7e5273..dbe012a3c 100644
--- a/test/testcondition.cpp
+++ b/test/testcondition.cpp
@@ -538,6 +538,25 @@ private:
               "    else if (!!a) {}\n"
               "}");
         ASSERT_EQUALS("[test.cpp:3]: (style) Expression is always false because 'else if' condition matches previous condition at line 2.\n", errout.str());
+
+        // #11059
+        check("int f();\n"
+              "void g() {\n"
+              "    int i = f();\n"
+              "    if (i == 3) {}\n"
+              "    else if ((i = f()) == 5) {}\n"
+              "    else if (i == 3) {}\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
+        check("int f();\n"
+              "void g() {\n"
+              "    int i = f();\n"
+              "    if (i == 3) {}\n"
+              "    else if ((i = f()) == 5) {}\n"
+              "    else if (i != 3) {}\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void checkPureFunction_(const char code[], const char* file, int line) {