diff --git a/tools/building.py b/tools/building.py
index 24f661de88b23f4f8876e73cefd07d3071d2cc12..79e6fd1a4b06657c9f074d141e4017f2fca3eb90 100644
--- a/tools/building.py
+++ b/tools/building.py
@@ -495,6 +495,9 @@ def EndBuilding(target, program = None):
         CscopeDatabase(Projects)
 
 def SrcRemove(src, remove):
+    if not src:
+        return
+
     if type(src[0]) == type('str'):
         for item in src:
             if os.path.basename(item) in remove: