1 files changed, 1 insertions, 1 deletions
diff --git a/src/pre.l b/src/pre.l
index 903b69e..8123ae2 100644
--- a/src/pre.l
+++ b/src/pre.l
@@ -2049,7 +2049,7 @@ void preprocessFile(const char *fileName,BufStr &output)
   }
   else
   {
-    QCString cmd = inputFilter+" "+fileName;
+    QCString cmd = inputFilter+" \""+fileName+"\"";
     preYYin = popen(cmd,"r");
     if (!preYYin)
     {