diff --git a/pkgs/development/tools/backblaze-b2/default.nix b/pkgs/development/tools/backblaze-b2/default.nix
index 6b133d959cc..79041b05557 100644
--- a/pkgs/development/tools/backblaze-b2/default.nix
+++ b/pkgs/development/tools/backblaze-b2/default.nix
@@ -33,7 +33,7 @@ buildPythonApplication rec {
   postInstall = ''
     mv "$out/bin/b2" "$out/bin/backblaze-b2"
 
-    sed 's/^have b2 \&\&$/_have backblaze-b2 \&\&/'  -i contrib/bash_completion/b2
+    sed 's/^_have b2 \&\&$/_have backblaze-b2 \&\&/'  -i contrib/bash_completion/b2
     sed 's/^\(complete -F _b2\) b2/\1 backblaze-b2/' -i contrib/bash_completion/b2
 
     mkdir -p "$out/etc/bash_completion.d"