diff --git a/base/Makefile.third b/base/Makefile.third
index f6a80523..1080ab98 100644
--- a/base/Makefile.third
+++ b/base/Makefile.third
@@ -138,7 +138,6 @@ $(MUPDF_LIB): $(JPEG_LIB) \
 		$(LIBWEBP_LIB) \
 		$(ZLIB) $(AES_LIB) \
 		$(THIRDPARTY_DIR)/mupdf/*.*
-	-rm -rf $(MUPDF_BUILD_DIR)
 	install -d $(MUPDF_BUILD_DIR)
 	cd $(MUPDF_BUILD_DIR) && \
 		$(CMAKE) $(CMAKE_FLAGS) \
@@ -665,7 +664,6 @@ $(OUTPUT_DIR)/data/KoboUSBMS.tar.gz: $(THIRDPARTY_DIR)/kobo-usbms/*.*
 # ===========================================================================
 # common lua library for networking
 $(LUASOCKET): $(THIRDPARTY_DIR)/luasocket/*.*
-	-rm -rf $(LUASOCKET) $(LUASOCKET_BUILD_DIR)
 	install -d $(LUASOCKET_BUILD_DIR)
 	cd $(LUASOCKET_BUILD_DIR) && \
 		$(CMAKE) $(CMAKE_FLAGS) \