diff --git a/gui/resultstree.cpp b/gui/resultstree.cpp
index 5821d0043..a1117a2ae 100644
--- a/gui/resultstree.cpp
+++ b/gui/resultstree.cpp
@@ -168,7 +168,10 @@ QStandardItem *ResultsTree::AddBacktraceFiles(QStandardItem *parent,
     // Check for duplicate rows and don't add them if found
     for (int i = 0; i < parent->rowCount(); i++)
     {
-        // the first column is the file name and is always the same so skip it
+        // The first column is the file name and is always the same so
+        // we skip it in other platforms than Windows, where filename case
+        // is ignored. So in Windows we can get filenames "header.h" and
+        // "Header.h" and must compare them as identical filenames.
 
         // the third column is the line number so check it first
         if (parent->child(i, 2)->text() == list[2]->text())
@@ -176,11 +179,18 @@ QStandardItem *ResultsTree::AddBacktraceFiles(QStandardItem *parent,
             // the second column is the severity so check it next
             if (parent->child(i, 1)->text() == list[1]->text())
             {
-                // the forth column is the message so check it last
+                // the fourth column is the message so check it last
                 if (parent->child(i, 3)->text() == list[3]->text())
                 {
+#if defined(_WIN32)
+                    const QString first = parent->child(i, 0)->text().toLower();
+                    const QString second = list[0]->text().toLower();
+                    if (first == second)
+                        return 0;
+#else
                     // this row matches so don't add it
                     return 0;
+#endif // _WIN32
                 }
             }
         }