diff --git a/build.gradle b/build.gradle
index 077532e1c693141ca00a5add63e9d9a6e62cba7d..4074bc5f507abad3be846e197cb1563269eedb5c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -143,3 +143,4 @@ jastadd {
 
 clean.dependsOn(cleanGen)
 generateAst.dependsOn(relast)
+jar.dependsOn("relast.preprocessor:jar") // the jar is a fat jar that contains the jar of the preprocessor
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