diff --git a/builders/windows-builder.py b/builders/windows-builder.py
index 24613a8..02ccdf5 100644
--- a/builders/windows-builder.py
+++ b/builders/windows-builder.py
@@ -164,7 +164,7 @@ class WindowsBuilder(Builder):
                 else:
                     file_ = E.File(Id=file_id, KeyPath='yes', Source=source)
                     component = E.Component(file_, Id=component_id, Guid='*')
-                if 'OpenLP.exe' in source:
+                if source.endswith('OpenLP.exe'):
                     description = 'Firewall exception for OpenLP\'s remote interface (UDP)'
                     program = '[#file_e368869eb54b01e2288a3359b1cf51f8]'
                     component.append(FxE.FirewallException(Id='OpenLP_TCP', Name='OpenLP',