diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index 7726b2a7f..27d69e803 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -2345,7 +2345,8 @@ void CheckOther::checkMathFunctions()
         for (const Token* tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
             if (tok->varId())
                 continue;
-            if (Token::Match(tok, "log|logf|logl|log10|log10f|log10l ( %num% )")) {
+            if (!Token::Match(tok->previous(),".|->")
+                && Token::Match(tok, "log|logf|logl|log10|log10f|log10l ( %num% )")) {
                 bool isNegative = MathLib::isNegative(tok->strAt(2));
                 bool isInt = MathLib::isInt(tok->strAt(2));
                 bool isFloat = MathLib::isFloat(tok->strAt(2));
diff --git a/test/testother.cpp b/test/testother.cpp
index 48ee348e1..6b2c02eb2 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -1651,6 +1651,10 @@ private:
         // #3473 - no warning if "log" is a variable
         check("Fred::Fred() : log(0) { }");
         ASSERT_EQUALS("", errout.str());
+
+        // #5748
+        check("void f() { foo.log(0); }");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void mathfunctionCall_acos() {