diff --git a/Scripts/build_aggregate.sh b/Scripts/build_aggregate.sh
index 762969ca..38da239e 100755
--- a/Scripts/build_aggregate.sh
+++ b/Scripts/build_aggregate.sh
@@ -11,6 +11,8 @@ echo $FRAMEWORKS_DIR
 
 UNIVERSAL_OUTPUTFOLDER=${BUILD_DIR}/universal
 
+xcodebuild -project ./MVMCoreUI.xcodeproj -clean
+
 # Step 1. Build Device and Simulator versions
 xcodebuild -scheme "${C_PROJECT_NAME}" ONLY_ACTIVE_ARCH=NO -configuration ${PHONE_CONFIGURATION} -sdk iphoneos -archivePath "${BUILD_DIR}/${PHONE_CONFIGURATION}-iphoneos/${C_PROJECT_NAME}" archive SKIP_INSTALL=false FRAMEWORK_SEARCH_PATHS=$FRAMEWORKS_DIR