diff --git a/alloy.py b/alloy.py
index 57d8df1e..d3d1504c 100755
--- a/alloy.py
+++ b/alloy.py
@@ -105,6 +105,8 @@ def build_LLVM(version_LLVM, revision, folder, tarball, debug, selfbuild, extra,
         revision = "-" + revision
     if folder == "":
         folder = FOLDER_NAME
+    if debug == True:
+        folder = folder + "dbg"
     LLVM_SRC="llvm-" + folder
     LLVM_BUILD="build-" + folder
     LLVM_BIN="bin-" + folder