diff --git a/src/libs/utils/filenamevalidatinglineedit.cpp b/src/libs/utils/filenamevalidatinglineedit.cpp
index 8c3cdeaabff..8aab1aea733 100644
--- a/src/libs/utils/filenamevalidatinglineedit.cpp
+++ b/src/libs/utils/filenamevalidatinglineedit.cpp
@@ -84,14 +84,11 @@ void FileNameValidatingLineEdit::setAllowDirectories(bool v)
 
 /* Validate a file base name, check for forbidden characters/strings. */
 
-#ifdef Q_OS_WIN
-#  define SLASHES "/\\"
-#else
-#  define SLASHES "/"
-#endif
 
-static const char notAllowedCharsSubDir[]   = "={}[]~!?:&*\"|#%<>$\"'();`' ";
-static const char notAllowedCharsNoSubDir[] = "={}[]~!?:&*\"|#%<>$\"'();`' "SLASHES;
+#define SLASHES "/\\"
+
+static const char notAllowedCharsSubDir[]   = ",^@=+{}[]~!?:&*\"|#%<>$\"'();`' ";
+static const char notAllowedCharsNoSubDir[] = ",^@=+{}[]~!?:&*\"|#%<>$\"'();`' "SLASHES;
 
 static const char *notAllowedSubStrings[] = {".."};