diff --git a/.gitmodules b/.gitmodules
index 9e4790c6f4856dddd191d45307a758af8a9a587f..9d49f3395f9f564efb81bb50fbadee37170cd59e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,4 @@
 [submodule "relast.preprocessor"]
 	path = relast.preprocessor
 	url = ../../jastadd/relast-preprocessor.git
+	branch = develop