diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index f62ee2c0b..88263f687 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -5973,15 +5973,14 @@ bool Tokenizer::simplifyKnownVariables()
                     // Variable is used somehow in a non-defined pattern => bail out
                     if (tok3->varId() == varid)
                     {
-                        // calling member function.. bail out because this might
-                        // have different effects to the variable.
-                        if (Token::Match(tok3->next(), ". %var% ("))
-                            break;
-
                         // This is a really generic bailout so let's try to avoid this.
                         // There might be lots of false negatives.
                         if (_settings && _settings->debugwarnings)
                         {
+                            // suppress debug-warning when calling member function
+                            if (Token::Match(tok3->next(), ". %var% ("))
+                                break;
+
                             std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
                             ErrorLogger::ErrorMessage::FileLocation loc;
                             loc.line = tok3->linenr();