diff --git a/.gitignore b/.gitignore
index 9aa07d068..5d6c51631 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,4 +19,5 @@
 .DS_store
 Gemfile.lock
 /_site
-_site
\ No newline at end of file
+_site
+*.tmp
\ No newline at end of file
diff --git a/Makefile b/Makefile
index a821b9f39..036281a04 100644
--- a/Makefile
+++ b/Makefile
@@ -402,7 +402,7 @@ copy-docs:
 		echo "---\nsort: ${ORDER}\n---\n" > ${DST}; \
 	fi
 	cat ${SRC} >> ${DST}
-	sed -i 's/<img src=\"docs\//<img src=\"/' ${DST}
+	sed -i '.tmp' 's/<img src=\"docs\//<img src=\"/' ${DST}
 
 # Copies docs for all components and adds the order tag.
 # For ORDER=0 it adds no order tag.