diff --git a/source/dub/internal/vibecompat/inet/path.d b/source/dub/internal/vibecompat/inet/path.d
index 3baf10d..d449944 100644
--- a/source/dub/internal/vibecompat/inet/path.d
+++ b/source/dub/internal/vibecompat/inet/path.d
@@ -132,8 +132,8 @@
 
 		foreach( i, f; m_nodes ){
 			version(Windows) { if( i > 0 ) ret.put('\\'); }
-			version(Posix) { if( i > 0 ) ret.put('/'); }
-			else { enforce("Unsupported OS"); }
+			else version(Posix) { if( i > 0 ) ret.put('/'); }
+			else { static assert(0, "Unsupported OS"); }
 			ret.put(f.toString());
 		}