diff --git a/dev.env b/dev.env
index 5e0b69b78c2..e31c16167e2 100644
--- a/dev.env
+++ b/dev.env
@@ -20,7 +20,7 @@
 #   to build a package to be run under a POSIX shell so non-POSIX
 #   syntax will break that as dev.env will not be sourced by bash..
 
-source build.env
+source ./build.env
 
 export GOTOP=$VTTOP/go
 export PYTOP=$VTTOP/py