diff --git a/helpers/make-icedove b/helpers/make-icedove
index 4b1579b..c436cb2 100644
--- a/helpers/make-icedove
+++ b/helpers/make-icedove
@@ -25,7 +25,7 @@ SIGNKEY="EA98120B"
 
 sed 's/mail-reader/mail-reader, thunderbird/' debian/control -i
 
-sed 's/gcc-4.7/gcc-4.9/; s/g++-4.7/g++-4.9/;' debian/control debian/rules
+sed 's/gcc-4.7/gcc-4.9/; s/g++-4.7/g++-4.9/;' debian/control debian/rules -i
 
 cat << EOF >> debian/icedove.js