diff --git a/docs/Makefile b/docs/Makefile
index d7f8225..3790fb8 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -1,5 +1,5 @@
 docs:
 	find -name '*.md' | while read -r line; \
 	do \
-	  mv "$${line:2}" "$$($${line:2} | tr '/' '_')"; \
+	  mv "$${line:2}" "$$(echo $${line:2} | tr '/' '_')"; \
 	done
\ No newline at end of file