diff --git a/project/jni/Makefile.prebuilt b/project/jni/Makefile.prebuilt
index 2aab04f8f..c98108a7d 100644
--- a/project/jni/Makefile.prebuilt
+++ b/project/jni/Makefile.prebuilt
@@ -34,7 +34,8 @@ $(ICONV) $(ICU): iconv/src/build.sh
 		cp -f $$ARCH/include/unicode/*.h ../../icuuc/include/unicode/  ; \
 		cp -f $$ARCH/include/layout/*.h ../../icuuc/include/layout/  ; \
 		cp -f $$ARCH/include/icu-le-hb/layout/*.h ../../icuuc/include/layout/  ; \
-	done
+	done && \
+	git clean -f -d -x
 
 $(OPENSSL): openssl/compile.sh
 	cd openssl && ./compile.sh
@@ -89,6 +90,7 @@ $(BOOST): boost/src/build-android.sh
 		$(foreach NAME, $(BOOST_LIBS), cp -f build/out/$$ARCH/lib/libboost_$(NAME)-clang-mt-*.a ../lib/$$ARCH/libboost_$(NAME).a || exit 1 ;) \
 		cp -r -f build/out/$$ARCH/include/boost-*/* ../include/ || exit 1 ; \
 	done || exit 1 ; \
+	git clean -f -d -x ; \
 	$(foreach NAME, $(BOOST_LIBS), ln -sf boost ../../boost_$(NAME) ;)
 
 boost: $(BOOST)
diff --git a/project/jni/openssl/compile.sh b/project/jni/openssl/compile.sh
index e11ae46cc..76f7ee2ed 100755
--- a/project/jni/openssl/compile.sh
+++ b/project/jni/openssl/compile.sh
@@ -98,3 +98,5 @@ cp -r -L build/arm64-v8a/include/openssl include/openssl || exit 1
 patch -p0 < opensslconf.h.patch || exit 1
 sed -i.tmp 's@".*/dist/.*"@"."@g' include/openssl/opensslconf.h
 rm -f include/openssl/opensslconf.h.tmp
+
+rm -rf build