diff --git a/general/genlib/js91.xml b/general/genlib/js91.xml
index f1fc5df698..3e34233269 100644
--- a/general/genlib/js91.xml
+++ b/general/genlib/js91.xml
@@ -187,7 +187,7 @@ esac</userinput></screen>
       in python-3.11:
     </para>
 
-<screen><userinput>grep -rl \"rU\" | sed -i 's/"rU"/"r"/'</userinput></screen>
+<screen><userinput>grep -rl \"rU\" | xargs sed -i 's/"rU"/"r"/'</userinput></screen>
 
     <para>
       Then run:
diff --git a/xsoft/graphweb/firefox.xml b/xsoft/graphweb/firefox.xml
index d2565f68a7..7599d68b39 100644
--- a/xsoft/graphweb/firefox.xml
+++ b/xsoft/graphweb/firefox.xml
@@ -361,7 +361,7 @@ echo "613364a7-9418-4c86-bcee-57e32fd70c23" > mozilla-key</userinput></screen>
       in python-3.11:
     </para>
 
-<screen><userinput>grep -rl \"rU\" | sed -i 's/"rU"/"r"/'</userinput></screen>
+<screen><userinput>grep -rl \"rU\" | xargs sed -i 's/"rU"/"r"/'</userinput></screen>
 
     <para>
       Now invoke the Python <command>mach</command> script to compile the package.
diff --git a/xsoft/graphweb/seamonkey.xml b/xsoft/graphweb/seamonkey.xml
index a20ddc22d8..5de1c9744f 100644
--- a/xsoft/graphweb/seamonkey.xml
+++ b/xsoft/graphweb/seamonkey.xml
@@ -274,7 +274,7 @@ EOF</userinput></screen>
       in python-3.11:
     </para>
 
-<screen><userinput>grep -rl \"rU\" | sed -i 's/"rU"/"r"/'</userinput></screen>
+<screen><userinput>grep -rl \"rU\" | xargs sed -i 's/"rU"/"r"/'</userinput></screen>
 
     <para>
       Compile <application>SeaMonkey</application> by running the following
diff --git a/xsoft/other/thunderbird.xml b/xsoft/other/thunderbird.xml
index a5ebe18c33..0d59a7f26f 100644
--- a/xsoft/other/thunderbird.xml
+++ b/xsoft/other/thunderbird.xml
@@ -252,7 +252,7 @@ esac</userinput></screen>
       in python-3.11:
     </para>
 
-<screen><userinput>grep -rl \"rU\" | sed -i 's/"rU"/"r"/'</userinput></screen>
+<screen><userinput>grep -rl \"rU\" | xargs sed -i 's/"rU"/"r"/'</userinput></screen>
 
 <screen><userinput>export MACH_BUILD_PYTHON_NATIVE_PACKAGE_SOURCE=none &amp;&amp;
 export MOZBUILD_STATE_PATH=./mozbuild                 &amp;&amp;