diff --git a/rename_sym.sh b/rename_sym.sh
index 7876a7ba..ffd68456 100755
--- a/rename_sym.sh
+++ b/rename_sym.sh
@@ -13,4 +13,4 @@ fi
 grep -rl "$1" asm/**/*.s src/**/*.{c,h} lib/**/*.{c,s} include/*.h data/dkr.data.s undefined_syms.txt | xargs sed -i "s/\b$1\b/$2/g"
 
 # This removes all the .o files that use the old name.
-grep -rl "$1" build/**/*.o | rm
+grep -rl "$1" build/**/*.o | xargs rm