diff --git a/electron-cash.spec b/electron-cash.spec
index d1b78f2..c32f7a1 100644
--- a/electron-cash.spec
+++ b/electron-cash.spec
@@ -56,7 +56,7 @@ rm -v lib/*.so*
 sed -i '/^qdarkstyle*/d' ./contrib/requirements/requirements.txt
 
 #hardcoded version for dateutil
-sed 's/python-dateutil==2.6.1/python-dateutil/g' contrib/requirements/requirements.txt
+sed -i 's/python-dateutil==2.6.1/python-dateutil/g' ./contrib/requirements/requirements.txt
 
 %build
 pyrcc5 icons.qrc -o gui/qt/icons_rc.py