diff --git a/xs/xsp/XS.xsp b/xs/xsp/XS.xsp
index 083d21d38..68ea282bc 100644
--- a/xs/xsp/XS.xsp
+++ b/xs/xsp/XS.xsp
@@ -23,12 +23,6 @@ BUILD()
         RETVAL = newSVpv(SLIC3R_BUILD_ID, 0);
     OUTPUT: RETVAL
 
-SV*
-DEBUG_OUT_PATH_PREFIX()
-    CODE:
-        RETVAL = newSVpv(SLIC3R_DEBUG_OUT_PATH_PREFIX, 0);
-    OUTPUT: RETVAL
-
 SV*
 FORK_NAME()
     CODE: