diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 66954f066..13ae85df4 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -3704,8 +3704,7 @@ static bool isVariableExpression(const Token* tok)
         return isVariableExpression(tok->astOperand1()) &&
                isVariableExpression(tok->astOperand2());
     if (Token::simpleMatch(tok, "["))
-        return isVariableExpression(tok->astOperand1()) &&
-               tok->astOperand2() && tok->astOperand2()->hasKnownIntValue();
+        return isVariableExpression(tok->astOperand1());
     return false;
 }
 
diff --git a/test/testother.cpp b/test/testother.cpp
index 3d9f24be6..829265a37 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -11053,6 +11053,20 @@ private:
               "    if (g(k(i))) {}\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        // #11889
+        check("struct S {\n"
+              "    int a[5];\n"
+              "    void f(int i);\n"
+              "}\n"
+              "void g(int);\n"
+              "void S::f(int i) {\n"
+              "    if (a[i] == 1) {\n"
+              "        a[i] = 0;\n"
+              "        g(a[i]);\n"
+              "    }\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void knownArgumentHiddenVariableExpression() {