diff --git a/extra/mandoc/build b/extra/mandoc/build
index e5c0f600..0f4ef916 100755
--- a/extra/mandoc/build
+++ b/extra/mandoc/build
@@ -2,7 +2,7 @@
 
 patch -p1 < mandoc-no-warn.patch
 
-sed -i '/int dummy/d' compat_err.c
+sed -i '/int dummy/d'         compat_err.c
 sed -i 's,"more -s","less",g' main.c
 sed -i "s/CC=.*/CC='$CC'/"    configure