diff --git a/uisimulator/x11/io.c b/uisimulator/x11/io.c
index 9551d101bb..974109a7fa 100644
--- a/uisimulator/x11/io.c
+++ b/uisimulator/x11/io.c
@@ -8,7 +8,7 @@ DIR *x11_opendir(char *name)
   char buffer[256]; /* sufficiently big */
 
   if(name[0] == '/') {
-    sprintf(buffer, "%s/%s", SIMULATOR_ARCHOS_ROOT, name);    
+    sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);    
     return opendir(buffer);
   }
   return opendir(name);
@@ -19,7 +19,7 @@ int x11_open(char *name, int opts)
   char buffer[256]; /* sufficiently big */
 
   if(name[0] == '/') {
-    sprintf(buffer, "%s/%s", SIMULATOR_ARCHOS_ROOT, name);
+    sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);
 
     Logf("We open the real file '%s'", buffer);
     return open(buffer, opts);