diff --git a/guix/build/go-build-system.scm b/guix/build/go-build-system.scm
index 973ee6e251..92a5c86d6c 100644
--- a/guix/build/go-build-system.scm
+++ b/guix/build/go-build-system.scm
@@ -158,6 +158,10 @@ unpacking."
       ((display "WARNING: The Go import path is unset.\n")))
   (if (string-null? unpack-path)
       (set! unpack-path import-path))
+  (when (string-null? import-path)
+    ((display "WARNING: The Go import path is unset.\n")))
+  (when (string-null? unpack-path)
+    (set! unpack-path import-path))
   (let ((dest (string-append (getenv "GOPATH") "/src/" unpack-path)))
     (mkdir-p dest)
     (if (file-is-directory? source)